Bug 1168662 - Return AppConstants.ANDROID_PACKAGE_NAME w/ EXTRA_APPLICATION_ID. r=margaret

This is more appropriate than our internal org.mozilla.gecko package name as it
provides the distinction across channels and has more public facing names than
gecko.

mobile/android/base/GeckoAppShell.java

@@ -1206,7 +1206,7 @@ public class GeckoAppShell
             // Some applications use this field to return to the same browser after processing the
             // Intent. While there is some danger (e.g. denial of service), other major browsers already
             // use it and so it's the norm.
-            intent.putExtra(Browser.EXTRA_APPLICATION_ID, GeckoApp.class.getPackage().getName());
+            intent.putExtra(Browser.EXTRA_APPLICATION_ID, AppConstants.ANDROID_PACKAGE_NAME);
         }
 
         return intent;