Set package name for official builds of Android Chromoting

TEST=Build remoting_apk with branding=Chrome, verify it runs OK, and verify 'aapt dump badging out/Debug/apks/ChromeRemoteDesktop.apk' shows new package name.

Review URL: https://codereview.chromium.org/155083003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248973 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248973