title: Android build error upon upgrading Cordova's camera plugin
body: <p>I am getting build error after updating cordova camera plugin from <strong>2.1.1</strong> to <strong>2.3.1</strong>.</p>
  
  <p>Version details:</p>
  
  <pre><code>cordova version: 6.3.1,
  cordova-plugin-camera 2.1.1 "Camera"
  </code></pre>
  
  <p>What I'm doing:</p>
  
  <pre><code>cordova plugin remove cordova-plugin-camera --save
  cordova plugin add cordova-plugin-camera --save
  </code></pre>
  
  <p>I see the <strong>config.xml</strong> file has been updated to:</p>
  
  <pre><code>&lt;plugin name="cordova-plugin-camera" spec="~2.3.1" /&gt;
  </code></pre>
  
  <p>When I build cordova android build I get the following error:</p>
  
  <pre><code>Error: cmd: Command failed with exit code 1 Error output:
  Note: Some input files use or override a deprecated API.
  Note: Recompile with -Xlint:deprecation for details.
  Note: Some input files use or override a deprecated API.
  Note: Recompile with -Xlint:deprecation for details.
  warning: string 'menu_settings' has no default translation.
  
  platforms\android\src\org\apache\cordova\camera\CameraLauncher.java:32:
      error: cannot find symbol
  
  import org.apache.cordova.BuildHelper;
  symbol:   class BuildHelper
  location: package org.apache.cordova
  platforms\android\src\org\apache\cordova\camera\CameraLauncher.java:140:
      error: cannot find symbol
  this.applicationId = (String)
  BuildHelper.getBuildConfigValue(cordova.getActivity(), "APPLICATION_ID");
                                    ^
  symbol:   variable BuildHelper
  location: class CameraLauncher
  Note: Some input files use or override a deprecated API.
  Note: Recompile with -Xlint:deprecation for details.
  Note: Some input files use unchecked or unsafe operations.
  Note: Recompile with -Xlint:unchecked for details.
  2 errors
  
  FAILURE: Build failed with an exception.
  * What went wrong:
  Execution failed for task ':compileDebugJavaWithJavac'.
  &gt; Compilation failed; see the compiler error output for details.
  
  * Try:
  Run with --stacktrace option to get the stack trace. Run with --info or
  --debug option to get more log output.
  </code></pre>