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This makes compositor_unittests compiles on Linux.

Although running it doesn't work yet because we return NULL in
TestCompositorHost::Create() and it expects something different than NULL.

R=sky@chromium.org

Review URL: http://codereview.chromium.org/7996005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@102391 0039d316-1c4b-4281-b951-d872f2087c98