History: Fix tablet layout regression.

BUG=302934,297402
R=sergiu@chromium.org

Review URL: https://codereview.chromium.org/25702002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226979 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226979