cc: Unify use of DidSwapBuffers() and did_request_swap

cc/trees/layer_tree_host_unittest_delegated.cc

Index: cc/trees/layer_tree_host_unittest_delegated.cc
diff --git a/cc/trees/layer_tree_host_unittest_delegated.cc b/cc/trees/layer_tree_host_unittest_delegated.cc
index a6562ae0bb3b041368fa4adad12d0f77c5b0f6aa..dc029a14b2b76cead57723b20527f9398d8ba1c0 100644
--- a/cc/trees/layer_tree_host_unittest_delegated.cc
+++ b/cc/trees/layer_tree_host_unittest_delegated.cc
@@ -590,11 +590,11 @@ class LayerTreeHostDelegatedTestLayerUsesFrameDamage
     first_draw_for_source_frame_ = true;
   }
 
-  virtual DrawSwapReadbackResult::DrawResult PrepareToDrawOnThread(
+  virtual DrawResult PrepareToDrawOnThread(
       LayerTreeHostImpl* host_impl,
       LayerTreeHostImpl::FrameData* frame,
-      DrawSwapReadbackResult::DrawResult draw_result) OVERRIDE {
-    EXPECT_EQ(DrawSwapReadbackResult::DRAW_SUCCESS, draw_result);
+      DrawResult draw_result) OVERRIDE {
+    EXPECT_EQ(DRAW_SUCCESS, draw_result);
 
     if (!first_draw_for_source_frame_)
       return draw_result;