Set sync server url correctly for Android.
Set sync server url correctly for Android.

There currently aren't any notions of channels for Android. However for
official builds we point to the prod sync server.


Review URL: http://codereview.chromium.org/10107024

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@132689 0039d316-1c4b-4281-b951-d872f2087c98

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