Enable core profile GL on Mac OSX

BUG=635081
TEST=mac bots
NOTRY=true
R=kbr@chromium.org,erikchen@chromium.org

Review-Url: https://codereview.chromium.org/2251263002
Cr-Commit-Position: refs/heads/master@{#415350}

ui/gl/init/gl_factory_mac.cc

@@ -22,7 +22,7 @@
 
 namespace features {
 const base::Feature kDesktopCoreProfileGLOnMac{
-    "DesktopCoreProfileGLOnMac", base::FEATURE_DISABLED_BY_DEFAULT};
+    "DesktopCoreProfileGLOnMac", base::FEATURE_ENABLED_BY_DEFAULT};
 }
 
 namespace gl {