Only focus the default item in the system tray when spoken feedback is enabled

BUG=315302

Review URL: https://codereview.chromium.org/60203005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233463 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233463
Rename WebKit namespace to blink (part 4)

This CL updates all references to the WebKit namespace in chrome and
components.

TBR=darin@chromium.org
BUG=295096

Review URL: https://codereview.chromium.org/63273002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233464 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233464