Google Store Locator
Actually you need to different keys one for the browser (client side) and one for the server . You already have configured your server key but you need to get a new key from google developer dashboard for the browser side .
then go to google_store_locator.module line 441 and change it to :

'js' =&gt; array('//maps.googleapis.com/maps/api/js?sensor=false&amp;libraries=places&amp;key=' . variable_get('geocoder_apikey_google_client') =&gt; array('type' =&gt; 'external')),