Telemetry: Disable external intent requests on Android.

By setting the "--disable-external-intent-requests" for Android browsers we
prevent Chrome from opening external apps for certain URLs (e.g. YouTube).
All URL requests should be handled by Chrome itself.

BUG=317678

Review URL: https://codereview.chromium.org/71283003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234828 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234828