Remove promise-7.0.4-min.js.map
MODIFY
plugin.xml
plugin.xml
<plugin id="cordova-plugin-googlemaps" version="2.6.3-20190614-1928" xmlns="http://apache.org/cordova/ns/plugins/1.0" xmlns:android="http://schemas.android.com/apk/res/android">
<name>cordova-plugin-googlemaps</name>
<js-module name="Promise" src="www/Promise.js" />
- <asset src="www/promise-7.0.4.min.js.map" target="promise-7.0.4.min.js.map" />
- <asset src="www/promise-7.0.4.min.js.map" target="plugins/cordova-plugin-googlemaps/www/promise-7.0.4.min.js.map" />
<js-module name="BaseClass" src="www/BaseClass.js">
<runs/>
</js-module>

MODIFY
www/Promise.js
www/Promise.js
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
!function n(t,e,r){function o(u,f){if(!e[u]){if(!t[u]){var c="function"==typeof require&&require;if(!f&&c)return c(u,!0);if(i)return i(u,!0);var s=new Error("Cannot find module '"+u+"'");throw s.code="MODULE_NOT_FOUND",s}var l=e[u]={exports:{}};t[u][0].call(l.exports,function(n){var e=t[u][1][n];return o(e?e:n)},l,l.exports,n,t,e,r)}return e[u].exports}for(var i="function"==typeof require&&require,u=0;u<r.length;u++)o(r[u]);return o}({1:[function(n,t,e){"use strict";function r(){}function o(n){try{return n.then}catch(t){return d=t,w}}function i(n,t){try{return n(t)}catch(e){return d=e,w}}function u(n,t,e){try{n(t,e)}catch(r){return d=r,w}}function f(n){if("object"!=typeof this)throw new TypeError("Promises must be constructed via new");if("function"!=typeof n)throw new TypeError("not a function");this._37=0,this._12=null,this._59=[],n!==r&&v(n,this)}function c(n,t,e){return new n.constructor(function(o,i){var u=new f(r);u.then(o,i),s(n,new p(t,e,u))})}function s(n,t){for(;3===n._37;)n=n._12;return 0===n._37?void n._59.push(t):void y(function(){var e=1===n._37?t.onFulfilled:t.onRejected;if(null===e)return void(1===n._37?l(t.promise,n._12):a(t.promise,n._12));var r=i(e,n._12);r===w?a(t.promise,d):l(t.promise,r)})}function l(n,t){if(t===n)return a(n,new TypeError("A promise cannot be resolved with itself."));if(t&&("object"==typeof t||"function"==typeof t)){var e=o(t);if(e===w)return a(n,d);if(e===n.then&&t instanceof f)return n._37=3,n._12=t,void h(n);if("function"==typeof e)return void v(e.bind(t),n)}n._37=1,n._12=t,h(n)}function a(n,t){n._37=2,n._12=t,h(n)}function h(n){for(var t=0;t<n._59.length;t++)s(n,n._59[t]);n._59=null}function p(n,t,e){this.onFulfilled="function"==typeof n?n:null,this.onRejected="function"==typeof t?t:null,this.promise=e}function v(n,t){var e=!1,r=u(n,function(n){e||(e=!0,l(t,n))},function(n){e||(e=!0,a(t,n))});e||r!==w||(e=!0,a(t,d))}var y=n("asap/raw"),d=null,w={};t.exports=f,f._99=r,f.prototype.then=function(n,t){if(this.constructor!==f)return c(this,n,t);var e=new f(r);return s(this,new p(n,t,e)),e}},{"asap/raw":4}],2:[function(n,t,e){"use strict";function r(n){var t=new o(o._99);return t._37=1,t._12=n,t}var o=n("./core.js");t.exports=o;var i=r(!0),u=r(!1),f=r(null),c=r(void 0),s=r(0),l=r("");o.resolve=function(n){if(n instanceof o)return n;if(null===n)return f;if(void 0===n)return c;if(n===!0)return i;if(n===!1)return u;if(0===n)return s;if(""===n)return l;if("object"==typeof n||"function"==typeof n)try{var t=n.then;if("function"==typeof t)return new o(t.bind(n))}catch(e){return new o(function(n,t){t(e)})}return r(n)},o.all=function(n){var t=Array.prototype.slice.call(n);return new o(function(n,e){function r(u,f){if(f&&("object"==typeof f||"function"==typeof f)){if(f instanceof o&&f.then===o.prototype.then){for(;3===f._37;)f=f._12;return 1===f._37?r(u,f._12):(2===f._37&&e(f._12),void f.then(function(n){r(u,n)},e))}var c=f.then;if("function"==typeof c){var s=new o(c.bind(f));return void s.then(function(n){r(u,n)},e)}}t[u]=f,0===--i&&n(t)}if(0===t.length)return n([]);for(var i=t.length,u=0;u<t.length;u++)r(u,t[u])})},o.reject=function(n){return new o(function(t,e){e(n)})},o.race=function(n){return new o(function(t,e){n.forEach(function(n){o.resolve(n).then(t,e)})})},o.prototype["catch"]=function(n){return this.then(null,n)}},{"./core.js":1}],3:[function(n,t,e){"use strict";function r(){if(c.length)throw c.shift()}function o(n){var t;t=f.length?f.pop():new i,t.task=n,u(t)}function i(){this.task=null}var u=n("./raw"),f=[],c=[],s=u.makeRequestCallFromTimer(r);t.exports=o,i.prototype.call=function(){try{this.task.call()}catch(n){o.onerror?o.onerror(n):(c.push(n),s())}finally{this.task=null,f[f.length]=this}}},{"./raw":4}],4:[function(n,t,e){(function(n){"use strict";function e(n){f.length||(u(),c=!0),f[f.length]=n}function r(){for(;s<f.length;){var n=s;if(s+=1,f[n].call(),s>l){for(var t=0,e=f.length-s;e>t;t++)f[t]=f[t+s];f.length-=s,s=0}}f.length=0,s=0,c=!1}function o(n){var t=1,e=new a(n),r=document.createTextNode("");return e.observe(r,{characterData:!0}),function(){t=-t,r.data=t}}function i(n){return function(){function t(){clearTimeout(e),clearInterval(r),n()}var e=setTimeout(t,0),r=setInterval(t,50)}}t.exports=e;var u,f=[],c=!1,s=0,l=1024,a=n.MutationObserver||n.WebKitMutationObserver;u="function"==typeof a?o(r):i(r),e.requestFlush=u,e.makeRequestCallFromTimer=i}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{}],5:[function(n,t,e){"function"!=typeof Promise.prototype.done&&(Promise.prototype.done=function(n,t){var e=arguments.length?this.then.apply(this,arguments):this;e.then(null,function(n){setTimeout(function(){throw n},0)})})},{}],6:[function(n,t,e){n("asap");"undefined"==typeof Promise&&(Promise=n("./lib/core.js"),n("./lib/es6-extensions.js")),n("./polyfill-done.js")},{"./lib/core.js":1,"./lib/es6-extensions.js":2,"./polyfill-done.js":5,asap:3}]},{},[6]);
-//# sourceMappingURL=promise-7.0.4.min.js.map

Remove promise-7.0.4-min.js.map