Rewrite base::JSONReader to be 35-40% faster, depending on the input string.

chrome/common/net/gaia/oauth2_mint_token_flow.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 "chrome/common/net/gaia/oauth2_mint_token_flow.h"
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 166 matching lines @@
       net::EscapeUrlEncodedData(parameters_.client_id, true).c_str(),
       net::EscapeUrlEncodedData(parameters_.extension_id, true).c_str());
 }
 
 void OAuth2MintTokenFlow::ProcessApiCallSuccess(
     const net::URLFetcher* source) {
   // TODO(munjal): Change error code paths in this method to report an
   // internal error.
   std::string response_body;
   source->GetResponseAsString(&response_body);
-  base::JSONReader reader;
-  scoped_ptr<base::Value> value(reader.Read(response_body, false));
+  scoped_ptr<base::Value> value(base::JSONReader::Read(response_body));
   DictionaryValue* dict = NULL;
   if (!value.get() || !value->GetAsDictionary(&dict)) {
     ReportFailure(GoogleServiceAuthError::FromConnectionError(101));
     return;
   }
 
   std::string issue_advice;
   if (!dict->GetString(kIssueAdviceKey, &issue_advice)) {
     ReportFailure(GoogleServiceAuthError::FromConnectionError(101));
     return;
@@ skipping 64 matching lines @@
 
     Tokenize(detail, kDetailSeparators, &entry.details);
     issue_advice->push_back(entry);
   }
 
   if (!success)
     issue_advice->clear();
 
   return success;
 }