Rename RootWindowHost* to WindowTreeHost*

content/browser/renderer_host/input/synthetic_gesture_target_aura.cc

Index: content/browser/renderer_host/input/synthetic_gesture_target_aura.cc
diff --git a/content/browser/renderer_host/input/synthetic_gesture_target_aura.cc b/content/browser/renderer_host/input/synthetic_gesture_target_aura.cc
index d03610ab725a2a4121d8a5d0d75d3c8f9ca144bb..ec516ce724437a6fd90493e48584b8c0a75a46f0 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_target_aura.cc
+++ b/content/browser/renderer_host/input/synthetic_gesture_target_aura.cc
@@ -48,8 +48,8 @@ void SyntheticGestureTargetAura::DispatchWebTouchEventToPlatform(
       touch_with_latency, &events, SCREEN_COORDINATES);
   DCHECK(conversion_success);
 
-  aura::RootWindowHostDelegate* root_window_host_delegate =
-      GetRootWindowHostDelegate();
+  aura::WindowTreeHostDelegate* root_window_host_delegate =
+      GetWindowTreeHostDelegate();
   for (ScopedVector<ui::TouchEvent>::iterator iter = events.begin(),
       end = events.end(); iter != end; ++iter) {
     root_window_host_delegate->OnHostTouchEvent(*iter);
@@ -70,7 +70,7 @@ void SyntheticGestureTargetAura::DispatchWebMouseWheelEventToPlatform(
   ui::MouseWheelEvent wheel_event(
       mouse_event, web_wheel.deltaX, web_wheel.deltaY);
 
-  GetRootWindowHostDelegate()->OnHostMouseEvent(&wheel_event);
+  GetWindowTreeHostDelegate()->OnHostMouseEvent(&wheel_event);
 }
 
 namespace {
@@ -137,7 +137,7 @@ void SyntheticGestureTargetAura::DispatchWebMouseEventToPlatform(
   int flags = WebMouseEventButtonToFlags(web_mouse.button);
   ui::MouseEvent mouse_event(event_type, location, location, flags, flags);
 
-  GetRootWindowHostDelegate()->OnHostMouseEvent(&mouse_event);
+  GetWindowTreeHostDelegate()->OnHostMouseEvent(&mouse_event);
 }
 
 SyntheticGestureParams::GestureSourceType
@@ -163,13 +163,13 @@ aura::Window* SyntheticGestureTargetAura::GetWindow() const {
   return window;
 }
 
-aura::RootWindowHostDelegate*
+aura::WindowTreeHostDelegate*
 SyntheticGestureTargetAura::GetRootWindowHostDelegate() const {
   aura::Window* root_window = GetWindow()->GetRootWindow();
-  aura::RootWindowHostDelegate* root_window_host_delegate =
-      root_window->GetDispatcher()->AsRootWindowHostDelegate();
-  DCHECK(root_window_host_delegate);
-  return root_window_host_delegate;
+  aura::WindowTreeHostDelegate* window_tree_host_delegate =
+      root_window->GetDispatcher()->AsWindowTreeHostDelegate();
+  DCHECK(window_tree_host_delegate);
+  return window_tree_host_delegate;
 }
 
 aura::client::ScreenPositionClient*