Revert of Add MemoryCoordinator

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index b7ad13af3307205195f2e6922f24139a573a6230..9a3795f2ddc0d1d801081766f2b817cad35cf6f6 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -77,10 +77,6 @@
 namespace media {
 class AudioHardwareConfig;
 class GpuVideoAcceleratorFactories;
-}
-
-namespace memory_coordinator {
-class ChildMemoryCoordinatorImpl;
 }
 
 namespace scheduler {
@@ -647,8 +643,6 @@
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
   std::unique_ptr<MemoryObserver> memory_observer_;
-  std::unique_ptr<memory_coordinator::ChildMemoryCoordinatorImpl>
-      memory_coordinator_;
 
   scoped_refptr<base::SingleThreadTaskRunner>
       main_thread_compositor_task_runner_;