Make ViewRoot the top of the ViewAndroid tree

ui/android/window_android.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_ANDROID_WINDOW_ANDROID_H_
 #define UI_ANDROID_WINDOW_ANDROID_H_
 
 #include <jni.h>
 #include <list>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "ui/android/ui_android_export.h"
-#include "ui/android/view_android.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace cc {
 class BeginFrameSource;
 }  // namespace cc
 
 namespace display {
 class DisplayAndroidManager;
 }  // namespace display
 
 namespace ui {
 
 class WindowAndroidCompositor;
 class WindowAndroidObserver;
 
 // Android implementation of the activity window.
-// WindowAndroid is also the root of a ViewAndroid tree.
-class UI_ANDROID_EXPORT WindowAndroid : public ViewAndroid {
+class UI_ANDROID_EXPORT WindowAndroid {
  public:
   WindowAndroid(JNIEnv* env, jobject obj, int display_id);
 
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
 
   base::android::ScopedJavaLocalRef<jobject> GetJavaObject();
 
   static bool RegisterWindowAndroid(JNIEnv* env);
 
   // Compositor callback relay.
@@ skipping 31 matching lines @@
   bool CanRequestPermission(const std::string& permission);
 
   static WindowAndroid* CreateForTesting();
   void DestroyForTesting();
 
  private:
   class WindowBeginFrameSource;
   friend class DisplayAndroidManager;
   friend class WindowBeginFrameSource;
 
-  ~WindowAndroid() override;
+  ~WindowAndroid();
 
   void SetNeedsBeginFrames(bool needs_begin_frames);
   void RequestVSyncUpdate();
 
-  // ViewAndroid overrides.
-  WindowAndroid* GetWindowAndroid() const override;
-
   // The ID of the display that this window belongs to.
   int display_id() const { return display_id_; }
 
   base::android::ScopedJavaGlobalRef<jobject> java_window_;
   const int display_id_;
   WindowAndroidCompositor* compositor_;
 
   base::ObserverList<WindowAndroidObserver> observer_list_;
 
   std::unique_ptr<WindowBeginFrameSource> begin_frame_source_;
   bool needs_begin_frames_;
   std::list<base::Closure> vsync_complete_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowAndroid);
 };
 
 }  // namespace ui
 
 #endif  // UI_ANDROID_WINDOW_ANDROID_H_