Fix extensions compile issues for Android on sync_unit_tests.

chrome/browser/ui/android/extensions/extension_view_android.h

+// Copyright (c) 2012 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 CHROME_BROWSER_UI_ANDROID_EXTENSIONS_EXTENSION_VIEW_ANDROID_H_
+#define CHROME_BROWSER_UI_ANDROID_EXTENSIONS_EXTENSION_VIEW_ANDROID_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "ui/gfx/size.h"
+
+class Browser;
+
+class ExtensionViewAndroid {
+ public:
+  Browser* browser() const { return NULL; }
+
+  void UpdatePreferredSize(const gfx::Size& new_size);
+  void RenderViewCreated();
+
+ private:
+  ExtensionViewAndroid() { }
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionViewAndroid);
+};
+
+#endif  // CHROME_BROWSER_UI_ANDROID_EXTENSIONS_EXTENSION_VIEW_ANDROID_H_