Move small c/b/extensions classes into extensions namespace no.1

chrome/browser/extensions/autoupdate_interceptor.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_AUTOUPDATE_INTERCEPTOR_H_
 #define CHROME_BROWSER_EXTENSIONS_AUTOUPDATE_INTERCEPTOR_H_
 
 #include <map>
 #include <string>
 
 #include "googleurl/src/gurl.h"
 #include "net/url_request/url_request.h"
 
+namespace extensions {
+
 // This url request interceptor lets us respond to localhost http request urls
 // with the contents of files on disk for use in tests.
 class AutoUpdateInterceptor
     : public net::URLRequest::Interceptor,
       public base::RefCountedThreadSafe<AutoUpdateInterceptor> {
  public:
   AutoUpdateInterceptor();
 
   // When computing matches, this ignores query parameters (since the autoupdate
   // fetch code appends a bunch of them to manifest fetches).
@@ skipping 11 matching lines @@
  private:
   friend class base::RefCountedThreadSafe<AutoUpdateInterceptor>;
 
   virtual ~AutoUpdateInterceptor();
 
   std::map<GURL, FilePath> responses_;
 
   DISALLOW_COPY_AND_ASSIGN(AutoUpdateInterceptor);
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_BROWSER_EXTENSIONS_AUTOUPDATE_INTERCEPTOR_H_