Add missing using statements for JNI types.

chrome/browser/platform_util_android.cc

 // 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.
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/logging.h"
 #include "chrome/browser/platform_util.h"
 #include "jni/PlatformUtil_jni.h"
 #include "ui/android/view_android.h"
 #include "url/gurl.h"
 
+using base::android::ScopedJavaLocalRef;
+
 namespace platform_util {
 
 // TODO: crbug/115682 to track implementation of the following methods.
 
 void ShowItemInFolder(Profile* profile, const base::FilePath& full_path) {
   NOTIMPLEMENTED();
 }
 
 void OpenItem(Profile* profile,
               const base::FilePath& full_path,
@@ skipping 27 matching lines @@
 void ActivateWindow(gfx::NativeWindow window) {
   NOTIMPLEMENTED();
 }
 
 bool IsVisible(gfx::NativeView view) {
   NOTIMPLEMENTED();
   return true;
 }
 
 } // namespace platform_util