Fix WindowAndroid leak in Android WebView

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 <vector>
 
@@ skipping 45 matching lines @@
   void SetNeedsAnimate();
   void OnVSync(JNIEnv* env,
                jobject obj,
                jlong time_micros,
                jlong period_micros);
   void Animate(base::TimeTicks begin_frame_time);
 
  private:
   ~WindowAndroid();
 
-  JavaObjectWeakGlobalRef weak_java_window_;
+  base::android::ScopedJavaGlobalRef<jobject> java_window_;
   gfx::Vector2dF content_offset_;
   WindowAndroidCompositor* compositor_;
 
   ObserverList<WindowAndroidObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowAndroid);
 };
 
 }  // namespace ui
 
 #endif  // UI_ANDROID_WINDOW_ANDROID_H_