Revert 139125 - Switch use_canvas_skia=1 for Linux/GTK.
Revert 139125 - Switch use_canvas_skia=1 for Linux/GTK.

This is so we can get rid of canvas_linux.cc and start
standardizing what the different canvas flags mean
between platforms.

BUG=105550
TEST=No visual change in Chrome UI.

Review URL: https://chromiumcodereview.appspot.com/10452023

TBR=asvitkine@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10444039

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@139139 0039d316-1c4b-4281-b951-d872f2087c98

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