Modified cancel and interrupt processing to avoid race with history.

chrome/browser/ui/webui/chromeos/imageburner/imageburner_ui.cc

 // Copyright (c) 2011 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/ui/webui/chromeos/imageburner/imageburner_ui.h"
 #include "chrome/browser/ui/webui/chromeos/imageburner/webui_handler.h"
 
 #include "base/i18n/rtl.h"
 #include "base/message_loop.h"
 #include "base/task.h"
@@ skipping 495 matching lines @@
 
   // Do cleanup.
   if (state  == StateMachine::DOWNLOADING) {
     if (active_download_item_) {
       // This will trigger Download canceled event. As a response to that event,
       // handlers will remove themselves as observers from download manager and
       // item.
       // We don't want to process Download Cancelled signal.
       active_download_item_->RemoveObserver(this);
       if (active_download_item_->IsPartialDownload())
-        active_download_item_->Cancel(true);
+        active_download_item_->Cancel();
       active_download_item_->Delete(DownloadItem::DELETE_DUE_TO_USER_DISCARD);
       active_download_item_ = NULL;
       CleanupDownloadObjects();
     }
   } else if (state == StateMachine::BURNING) {
     DCHECK(observing_burn_lib_);
     // Burn library doesn't send cancelled signal upon CancelBurnImage
     // invokation.
     chromeos::CrosLibrary::Get()->GetBurnLibrary()->CancelBurnImage();
     chromeos::CrosLibrary::Get()->GetBurnLibrary()->RemoveObserver(this);
@@ skipping 140 matching lines @@
 // ImageBurnUI
 //
 ////////////////////////////////////////////////////////////////////////////////
 
 ImageBurnUI::ImageBurnUI(TabContents* contents) : ChromeWebUI(contents) {
   imageburner::WebUIHandler* handler = new imageburner::WebUIHandler(contents);
   AddMessageHandler((handler)->Attach(this));
   imageburner::UIHTMLSource* html_source = new imageburner::UIHTMLSource();
   contents->profile()->GetChromeURLDataManager()->AddDataSource(html_source);
 }