[Refactoring] Gaia-specific strings are moved to the GaiaScreenHandler.

BUG=231331
TEST=none

Review URL: https://codereview.chromium.org/71383003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236124 0039d316-1c4b-4281-b951-d872f2087c98
Change accelerator_controller to use content::RecordAction directly.

(rather than calling into ChromeShellDelegate each time)

Clean up unused enum values.

BUG=

Review URL: https://codereview.chromium.org/75583002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236125 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236124
Fix incorrect perftest naming in vector_math_perftest.

Review URL: https://codereview.chromium.org/76553003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236126 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236126
Changes checkable HoverHighlightView to checkbox for a11y.

BUG=320054
R=stevenjb@chromium.org
TEST=manually

Review URL: https://codereview.chromium.org/76673002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236127 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236127