Use libyuv::ConvertToI420 for all all color formats in video capture on WIN

Since libyuv has added support for image flipping (vertically) with negative
src_height as indicator, we'd converge all color formats into one code path.
And libyuv provides better performance.

BUG=
R=sergeyu@chromium.org

Review URL: https://codereview.chromium.org/116573005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241755 0039d316-1c4b-4281-b951-d872f2087c98
Make combobox observers able to observe multiple comboboxes.

This is so AutofillDialogControllerImpl can observe both billing and shipping
country combobox models.

R=sky@chromium.org
BUG=317837

Review URL: https://codereview.chromium.org/118683002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241756 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241756
[MemSheriff] Widen PlatformThread::SetName suppression

NOTRY=true
TBR=thestig@chromium.org
BUG=106912

Review URL: https://codereview.chromium.org/118843002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241757 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241757