Fix header guard and namespace in android_webview

android_webview/browser/cookie_manager.cc

 // Copyright (c) 2011 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 "android_webview/browser/cookie_manager.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 611 matching lines @@
 }
 
 net::CookieStore* GetCookieStore() {
   return CookieManager::GetInstance()->GetCookieStore();
 }
 
 bool RegisterCookieManager(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-}  // android_webview namespace
+}  // namespace android_webview