cc: Make single-thread renderer compositor always synchronous.

content/test/fake_compositor_dependencies.h

Index: content/test/fake_compositor_dependencies.h
diff --git a/content/test/fake_compositor_dependencies.h b/content/test/fake_compositor_dependencies.h
index 0dac57b75e4fb82ac616963fe8bd25a4c2816216..45b7a1b1f7e56311dfe6ea34a94e480090e58162 100644
--- a/content/test/fake_compositor_dependencies.h
+++ b/content/test/fake_compositor_dependencies.h
@@ -43,16 +43,11 @@ class FakeCompositorDependencies : public CompositorDependencies {
   cc::TaskGraphRunner* GetTaskGraphRunner() override;
   bool IsGatherPixelRefsEnabled() override;
 
-  void set_use_single_thread_scheduler(bool use) {
-    use_single_thread_scheduler_ = use;
-  }
-
  private:
   cc::TestSharedBitmapManager shared_bitmap_manager_;
   cc::TestGpuMemoryBufferManager gpu_memory_buffer_manager_;
   cc::TestTaskGraphRunner task_graph_runner_;
   FakeRendererScheduler renderer_scheduler_;
-  bool use_single_thread_scheduler_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeCompositorDependencies);
 };