Rename RootWindowHost* to WindowTreeHost*

chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.cc

Index: chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.cc
diff --git a/chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.cc b/chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.cc
index 681a69fe1be4b360b84ca42b059b0a08ad91a84f..bdef58ffee03181d57ddfab8f3862b3975f20d79 100644
--- a/chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.cc
+++ b/chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.cc
@@ -81,7 +81,7 @@ void ChromeMetroViewerProcessHost::OnChannelError() {
   // connected.
   ::SetEnvironmentVariableA(env_vars::kMetroConnected, NULL);
 
-  aura::RemoteRootWindowHostWin::Instance()->Disconnected();
+  aura::RemoteWindowTreeHostWin::Instance()->Disconnected();
   g_browser_process->ReleaseModule();
 
   // If browser is trying to quit, we shouldn't reenter the process.
@@ -118,7 +118,7 @@ void ChromeMetroViewerProcessHost::OnSetTargetSurface(
     gfx::NativeViewId target_surface) {
   HWND hwnd = reinterpret_cast<HWND>(target_surface);
   // Tell our root window host that the viewer has connected.
-  aura::RemoteRootWindowHostWin::Instance()->Connected(this, hwnd);
+  aura::RemoteWindowTreeHostWin::Instance()->Connected(this, hwnd);
   // Now start the Ash shell environment.
   chrome::OpenAsh();
   ash::Shell::GetInstance()->CreateShelf();
@@ -152,6 +152,6 @@ void ChromeMetroViewerProcessHost::OnWindowSizeChanged(uint32 width,
       base::StringPrintf("%dx%d", width, height)));
   ash::Shell::GetInstance()->display_manager()->OnNativeDisplaysChanged(
       info_list);
-  aura::RemoteRootWindowHostWin::Instance()->HandleWindowSizeChanged(width,
+  aura::RemoteWindowTreeHostWin::Instance()->HandleWindowSizeChanged(width,
                                                                      height);
 }