Remove offscreen compositor contexts.

cc/test/layer_tree_test.cc

Index: cc/test/layer_tree_test.cc
diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index 5c85d160670ea09459dbc904a343a6d0fbccda96..f67ee7c7c84beece8934d8099d84fffcdf171291 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -271,10 +271,6 @@ class LayerTreeHostClientForTesting : public LayerTreeHostClient,
   virtual void DidPostSwapBuffers() OVERRIDE {}
   virtual void DidAbortSwapBuffers() OVERRIDE {}
 
-  virtual scoped_refptr<ContextProvider> OffscreenContextProvider() OVERRIDE {
-    return test_hooks_->OffscreenContextProvider();
-  }
-
  private:
   explicit LayerTreeHostClientForTesting(TestHooks* test_hooks)
       : test_hooks_(test_hooks) {}
@@ -682,13 +678,6 @@ scoped_ptr<FakeOutputSurface> LayerTreeTest::CreateFakeOutputSurface(
     return FakeOutputSurface::Create3d();
 }
 
-scoped_refptr<ContextProvider> LayerTreeTest::OffscreenContextProvider() {
-  if (!compositor_contexts_.get() ||
-      compositor_contexts_->DestroyedOnMainThread())
-    compositor_contexts_ = TestContextProvider::Create();
-  return compositor_contexts_;
-}
-
 TestWebGraphicsContext3D* LayerTreeTest::TestContext() {
   return static_cast<TestContextProvider*>(
       output_surface_->context_provider().get())->TestContext3d();