Chromium build failed with heap leak checker, or configured with 'gyp_chromiu...

chrome/common/net/gaia/gaia_auth_fetcher.cc

 // Copyright (c) 2010 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/gaia_auth_fetcher.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 343 matching lines @@
       return GoogleServiceAuthError(
           GoogleServiceAuthError::SERVICE_UNAVAILABLE);
     }
 
     LOG(WARNING) << "Incomprehensible response from Google Accounts servers.";
     return GoogleServiceAuthError(
         GoogleServiceAuthError::SERVICE_UNAVAILABLE);
   }
 
   NOTREACHED();
+  return GoogleServiceAuthError(GoogleServiceAuthError::SERVICE_UNAVAILABLE);
 }
 
 void GaiaAuthFetcher::OnClientLoginFetched(const std::string& data,
                                            const URLRequestStatus& status,
                                            int response_code) {
 
   if (status.is_success() && response_code == RC_REQUEST_OK) {
     VLOG(1) << "ClientLogin successful!";
     std::string sid;
     std::string lsid;
@@ skipping 61 matching lines @@
     NOTREACHED();
   }
 }
 
 // static
 bool GaiaAuthFetcher::IsSecondFactorSuccess(
     const std::string& alleged_error) {
   return alleged_error.find(kSecondFactor) !=
       std::string::npos;
 }