Make ViewRoot the top of the ViewAndroid tree

chrome/browser/android/vr_shell/vr_compositor.h

Index: chrome/browser/android/vr_shell/vr_compositor.h
diff --git a/chrome/browser/android/vr_shell/vr_compositor.h b/chrome/browser/android/vr_shell/vr_compositor.h
index 20aac81a028689ccbf1c6fd84bc08042932b8c8b..5dc8048b2b551596ec1eb654d21303ebba7ac526 100644
--- a/chrome/browser/android/vr_shell/vr_compositor.h
+++ b/chrome/browser/android/vr_shell/vr_compositor.h
@@ -24,14 +24,14 @@ class WebContents;
 }
 
 namespace ui {
-class WindowAndroid;
+class ViewRoot;
 }
 
 namespace vr_shell {
 
 class VrCompositor : public content::CompositorClient {
  public:
-  VrCompositor(ui::WindowAndroid* window, bool is_transparent);
+  VrCompositor(ui::ViewRoot* view_root, bool is_transparent);
   ~VrCompositor() override;
 
   void SurfaceDestroyed();