Android: Clean up the ANGLE APK * Rename the APK package name to reflect that it is from Chromium build. * Rename the application to reflect it is no longer used on Android system image. * Remove code supporting multiple APKs, since we only have one now. * Remove the placeholder icon, which is no longer needed. * Remove the ANGLE_FOR_ANDROID intent, since this APK is not built in. * Remove the java code since since it was only in support of the intent. * Remove most apps from the rules file. Bug: angleproject:3396 Change-Id: Ic6a2fd03e5686026ab4650fc0c25adb298af03c2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1579389 Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Cody Northrop <cnorthrop@google.com>