GitLab

Revert of Use real PlatformSupport in content unit tests (https://codereview.chromium.org/287043002/)

Reason for revert:
Caused mac_valgrind issues because TestWebKitPlatformSupport isn't cleaning up after itself properly

Original issue's description:
> Use real PlatformSupport in content unit tests
> 
> Once all pages are force composited by default, this allows these tests
> to not explode when trying to create GraphicsLayers because of a lack of
> Platform::compositorSupport.
> 
> BUG=none
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=270894
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271229

TBR=piman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=none

Review URL: https://codereview.chromium.org/290303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271261 0039d316-1c4b-4281-b951-d872f2087c98