Introduce ERR_NETWORK_CHANGED and allow URLFetcher to automatically retry on that error.

chrome/browser/chrome_to_mobile_service.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/browser/chrome_to_mobile_service.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/guid.h"
@@ skipping 512 matching lines @@
     return;
   }
 
   data->type = SNAPSHOT;
   SendJobRequest(observer, *data);
 }
 
 void ChromeToMobileService::InitRequest(net::URLFetcher* request) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   request->SetRequestContext(profile_->GetRequestContext());
-  request->SetMaxRetries(kMaxRetries);
+  request->SetMaxRetriesOn5xx(kMaxRetries);
   DCHECK(!access_token_.empty());
   request->SetExtraRequestHeaders("Authorization: OAuth " +
       access_token_ + "\r\n" + cloud_print::kChromeCloudPrintProxyHeader);
   request->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                         net::LOAD_DO_NOT_SAVE_COOKIES);
 }
 
 void ChromeToMobileService::SendJobRequest(base::WeakPtr<Observer> observer,
                                            const JobData& data) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
@@ skipping 194 matching lines @@
 
       // Report failure below and ignore the second response.
       request_observer_map_.erase(other);
       break;
     }
   }
 
   if (observer.get())
     observer->OnSendComplete(success);
 }