Re-enable ScrollingCoordinatorChromium tests on Android

These tests were disabled a long time ago because they were crashing,
but now they seem to be passing fine.

BUG=159935,170787,152573

Review URL: https://codereview.chromium.org/95003005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237821 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237821