Remove dependency on Skia from chromoting client.

Now DesktopRegion, DesktopRect and DesktopSize are used instead of
corresponding skia types.

R=alexeypa@chromium.org
TBR=reed@google.com (for _moved_ skia dependency)

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=224101

Review URL: https://codereview.chromium.org/23440046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225265 0039d316-1c4b-4281-b951-d872f2087c98