Revert of Mojo multiple command buffer support and sample

mojo/services/view_manager/root_view_manager.cc

Index: mojo/services/view_manager/root_view_manager.cc
diff --git a/mojo/services/view_manager/root_view_manager.cc b/mojo/services/view_manager/root_view_manager.cc
index 2b73375077cc9c02a2aec1ac497e2b54aeea1796..d44535dc5781089740b266e927fc523df219836a 100644
--- a/mojo/services/view_manager/root_view_manager.cc
+++ b/mojo/services/view_manager/root_view_manager.cc
@@ -7,7 +7,6 @@
 #include "base/auto_reset.h"
 #include "base/scoped_observer.h"
 #include "mojo/public/cpp/application/application_connection.h"
-#include "mojo/services/public/interfaces/gpu/gpu.mojom.h"
 #include "mojo/services/view_manager/root_node_manager.h"
 #include "mojo/services/view_manager/root_view_manager_delegate.h"
 #include "mojo/services/view_manager/screen_impl.h"
@@ -82,18 +81,14 @@
   NativeViewportPtr viewport;
   app_connection->ConnectToService(
       "mojo:mojo_native_viewport_service", &viewport);
-  GpuPtr gpu_service;
-  // TODO(jamesr): Should be mojo:mojo_gpu_service
-  app_connection->ConnectToService("mojo:mojo_native_viewport_service",
-                                   &gpu_service);
   window_tree_host_.reset(new WindowTreeHostImpl(
-      viewport.Pass(),
-      gpu_service.Pass(),
-      gfx::Rect(800, 600),
-      base::Bind(&RootViewManager::OnCompositorCreated, base::Unretained(this)),
-      native_viewport_closed_callback,
-      base::Bind(&RootNodeManager::DispatchNodeInputEventToWindowManager,
-                 base::Unretained(root_node_manager_))));
+        viewport.Pass(),
+        gfx::Rect(800, 600),
+        base::Bind(&RootViewManager::OnCompositorCreated,
+                   base::Unretained(this)),
+        native_viewport_closed_callback,
+        base::Bind(&RootNodeManager::DispatchNodeInputEventToWindowManager,
+                   base::Unretained(root_node_manager_))));
 }
 
 RootViewManager::~RootViewManager() {