Remove offscreen compositor contexts.

cc/output/output_surface_unittest.cc

Index: cc/output/output_surface_unittest.cc
diff --git a/cc/output/output_surface_unittest.cc b/cc/output/output_surface_unittest.cc
index 637ba05c39494d0bf330d5c4325dff20ddc07635..9e7724f2d2acc0fc3b95aefc34c08fe9b6cd11a9 100644
--- a/cc/output/output_surface_unittest.cc
+++ b/cc/output/output_surface_unittest.cc
@@ -40,8 +40,7 @@ class TestOutputSurface : public OutputSurface {
 
   bool InitializeNewContext3d(
       scoped_refptr<ContextProvider> new_context_provider) {
-    return InitializeAndSetContext3d(new_context_provider,
-                                     scoped_refptr<ContextProvider>());
+    return InitializeAndSetContext3d(new_context_provider);
   }
 
   using OutputSurface::ReleaseGL;
@@ -210,12 +209,6 @@ TEST_F(OutputSurfaceTestInitializeNewContext3d, Context3dMakeCurrentFails) {
   InitializeNewContextExpectFail();
 }
 
-TEST_F(OutputSurfaceTestInitializeNewContext3d, ClientDeferredInitializeFails) {
-  BindOutputSurface();
-  client_.set_deferred_initialize_result(false);
-  InitializeNewContextExpectFail();
-}
-
 TEST(OutputSurfaceTest, BeginFrameEmulation) {
   TestOutputSurface output_surface(TestContextProvider::Create());
   EXPECT_FALSE(output_surface.HasClient());