favor DCHECK_CURRENTLY_ON for better logs in chrome/browser/chromeos/

chrome/browser/chromeos/policy/policy_oauth2_token_fetcher.cc

 // Copyright (c) 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/chromeos/policy/policy_oauth2_token_fetcher.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 85 matching lines @@
 void PolicyOAuth2TokenFetcher::OnGetTokenFailure(
     const GoogleServiceAuthError& error) {
   LOG(ERROR) << "OAuth2 access token (device management) fetching failed!";
   RetryOnError(error,
                base::Bind(&PolicyOAuth2TokenFetcher::StartFetchingAccessToken,
                           AsWeakPtr()));
 }
 
 void PolicyOAuth2TokenFetcher::RetryOnError(const GoogleServiceAuthError& error,
                                             const base::Closure& task) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if ((error.state() == GoogleServiceAuthError::CONNECTION_FAILED ||
        error.state() == GoogleServiceAuthError::SERVICE_UNAVAILABLE ||
        error.state() == GoogleServiceAuthError::REQUEST_CANCELED) &&
       retry_count_ < kMaxRequestAttemptCount) {
     retry_count_++;
     BrowserThread::PostDelayedTask(
         BrowserThread::UI, FROM_HERE, task,
         base::TimeDelta::FromMilliseconds(kRequestRestartDelay));
     return;
   }
   LOG(ERROR) << "Unrecoverable error or retry count max reached.";
   failed_ = true;
   // Invoking the |callback_| signals to the owner of this object that it has
   // completed, and the owner may delete this object on the callback method.
   // So don't rely on |this| still being valid after ForwardPolicyToken()
   // returns i.e. don't write to |failed_| or other fields.
   ForwardPolicyToken(std::string(), error);
 }
 
 void PolicyOAuth2TokenFetcher::ForwardPolicyToken(
     const std::string& token,
     const GoogleServiceAuthError& error) {
   if (!callback_.is_null())
     callback_.Run(token, error);
 }
 
 }  // namespace policy