Remove static thread pointers from CC

cc/texture_update_controller.cc

Index: cc/texture_update_controller.cc
diff --git a/cc/texture_update_controller.cc b/cc/texture_update_controller.cc
index 59781c90d0173ce48c5aeb8da2babbf2826aff70..80db40fd6d5c45ba9c35cad6a0232c38643c0fa9 100644
--- a/cc/texture_update_controller.cc
+++ b/cc/texture_update_controller.cc
@@ -126,10 +126,11 @@ void CCTextureUpdateController::updateTexture(ResourceUpdate update)
         DCHECK(m_resourceProvider->resourceType(texture->resourceId()) ==
                CCResourceProvider::GLTexture);
 
-        WebGraphicsContext3D* paintContext = CCProxy::hasImplThread() ?
+        bool hasImplThread = m_resourceProvider->proxy()->hasImplThread();
+        WebGraphicsContext3D* paintContext = hasImplThread ?
             WebSharedGraphicsContext3D::compositorThreadContext() :
             WebSharedGraphicsContext3D::mainThreadContext();
-        GrContext* paintGrContext = CCProxy::hasImplThread() ?
+        GrContext* paintGrContext = hasImplThread ?
             WebSharedGraphicsContext3D::compositorThreadGrContext() :
             WebSharedGraphicsContext3D::mainThreadGrContext();