Add some unit tests for SyncData.

BUG=

Review URL: https://codereview.chromium.org/174443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252763 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252763
Switch DomAutomationController to be a RenderFrameObserver.

BUG=304341
TBR=nasko@chromium.org

Review URL: https://codereview.chromium.org/157713002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252764 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252764