Prefix string16 with base:: in ui/.

R=sky@chromium.org, tsepez@chromium.org
BUG=329295

Review URL: https://codereview.chromium.org/117983002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241625 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241625
Suppress ignored acks for various mouse event types

The only mouse event type that has a meaningful ack is MouseMove.  Ignore all
other mouse event acks, reducing unnecessary IPC traffic.

BUG=302852

Review URL: https://codereview.chromium.org/105623004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241626 0039d316-1c4b-4281-b951-d872f2087c98
Disable one more cast_unittest on OS_WIN.
This one (LoopNoLossPcm16ExternalDecoder) fails on win7 x64,
but not win7 x86.

TBR=mikhal@chromium.org
BUG=329563

Review URL: https://codereview.chromium.org/118563002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241628 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241628