Roll webrtc 5122:5218

R=ronghuawu@chromium.org

Review URL: https://codereview.chromium.org/94133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238864 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238865 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238865
Change ScreenshotTaker to use ScopedClipboardWriter.

WriteObjects() was originally designed so that it'd be possible to
serialize data from the renderer to be written to the clipboard in the
browser. Its implementation is going to become more sane, so refactor
callers that depend on the current quirky interface to use
ScopedClipboardWriter instead.

BUG=319285

Review URL: https://codereview.chromium.org/103233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238866 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238866