Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/managed_mode/managed_user_refresh_token_fetcher.cc

 // 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.
 
 #include "chrome/browser/managed_mode/managed_user_refresh_token_fetcher.h"
 
 #include "base/callback.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
@@ skipping 186 matching lines @@
     DLOG(WARNING) << "HTTP error " << response_code;
     DispatchGoogleServiceAuthError(
         GoogleServiceAuthError(GoogleServiceAuthError::CONNECTION_FAILED),
         std::string());
     return;
   }
 
   std::string response_body;
   source->GetResponseAsString(&response_body);
   scoped_ptr<base::Value> value(base::JSONReader::Read(response_body));
-  DictionaryValue* dict = NULL;
+  base::DictionaryValue* dict = NULL;
   if (!value.get() || !value->GetAsDictionary(&dict)) {
     DispatchNetworkError(net::ERR_INVALID_RESPONSE);
     return;
   }
   std::string auth_code;
   if (!dict->GetString(kCodeKey, &auth_code)) {
     DispatchNetworkError(net::ERR_INVALID_RESPONSE);
     return;
   }
 
@@ skipping 55 matching lines @@
 ManagedUserRefreshTokenFetcher::Create(OAuth2TokenService* oauth2_token_service,
                                        const std::string& account_id,
                                        URLRequestContextGetter* context) {
   scoped_ptr<ManagedUserRefreshTokenFetcher> fetcher(
       new ManagedUserRefreshTokenFetcherImpl(oauth2_token_service, account_id,
           context));
   return fetcher.Pass();
 }
 
 ManagedUserRefreshTokenFetcher::~ManagedUserRefreshTokenFetcher() {}