Get rid of virtual Display::CreateScheduler.

cc/surfaces/surface_display_output_surface_unittest.cc

Index: cc/surfaces/surface_display_output_surface_unittest.cc
diff --git a/cc/surfaces/surface_display_output_surface_unittest.cc b/cc/surfaces/surface_display_output_surface_unittest.cc
index 44859b06bf6690ef0d37df45d0137ac9c6305ed3..81c2c6e190e63925fd8903d82e182fe16f101181 100644
--- a/cc/surfaces/surface_display_output_surface_unittest.cc
+++ b/cc/surfaces/surface_display_output_surface_unittest.cc
@@ -27,7 +27,7 @@ class SurfaceDisplayOutputSurfaceTest : public testing::Test {
   SurfaceDisplayOutputSurfaceTest()
       : now_src_(new base::SimpleTestTickClock()),
         task_runner_(new OrderedSimpleTaskRunner(now_src_.get(), true)),
-        begin_frame_source_(new BackToBackBeginFrameSource(task_runner_.get())),
+        begin_frame_source_(task_runner_.get()),
         allocator_(0),
         display_size_(1920, 1080),
         display_rect_(display_size_),
@@ -39,17 +39,14 @@ class SurfaceDisplayOutputSurfaceTest : public testing::Test {
     display_output_surface_ = display_output_surface.get();
     display_output_surface_->set_max_frames_pending(2);
 
-    display_.reset(new Display(&surface_manager_, &bitmap_manager_,
-                               &gpu_memory_buffer_manager_, renderer_settings_,
-                               allocator_.id_namespace(), task_runner_.get(),
-                               std::move(display_output_surface)));
+    display_.reset(new Display(
+        &surface_manager_, &bitmap_manager_, &gpu_memory_buffer_manager_,
+        renderer_settings_, allocator_.id_namespace(), task_runner_.get(),
+        &begin_frame_source_, std::move(display_output_surface)));
     delegated_output_surface_.reset(new SurfaceDisplayOutputSurface(
         &surface_manager_, &allocator_, display_.get(), context_provider_,
         nullptr));
 
-    // Set the Display's begin frame source like a real browser compositor
-    // output surface would.
-    display_->SetBeginFrameSource(begin_frame_source_.get());
     delegated_output_surface_->BindToClient(&delegated_output_surface_client_);
     display_->Resize(display_size_);
 
@@ -85,7 +82,7 @@ class SurfaceDisplayOutputSurfaceTest : public testing::Test {
  protected:
   std::unique_ptr<base::SimpleTestTickClock> now_src_;
   scoped_refptr<OrderedSimpleTaskRunner> task_runner_;
-  std::unique_ptr<BackToBackBeginFrameSource> begin_frame_source_;
+  BackToBackBeginFrameSource begin_frame_source_;
   SurfaceIdAllocator allocator_;
 
   const gfx::Size display_size_;