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: svn://svn.chromium.org/chrome/trunk/src@139139 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -499,7 +499,7 @@
         #
         # On Aura, this allows per-tile painting to be used in the browser
         # compositor.
-        ['OS!="mac" and OS!="android"', {
+        ['use_aura==1 or OS=="win"', {
           'use_canvas_skia%': 1,
         }],
       ],