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In order to make touch text selection ready for Windows and other Aura
platforms, a prerequisite is to enable tests. Following tests are
enabled:
 - TouchSelectionControllerImplTest in views_unittests;
 - TouchEditableImplAuraTest in content_browsertests.

BUG=377561

Review URL: https://codereview.chromium.org/304883002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273770 0039d316-1c4b-4281-b951-d872f2087c98