Fix crashes in DownloadRequestLimiter when extension popups/bubbles initiate downloads automatically

chrome/browser/extensions/extension_host.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 17 matching lines @@
 #include "chrome/browser/ui/gtk/extensions/extension_view_gtk.h"
 #elif defined(OS_ANDROID)
 #include "chrome/browser/ui/android/extensions/extension_view_android.h"
 #endif
 
 class Browser;
 class ExtensionWindowController;
 class PrefsTabHelper;
 
 namespace content {
+class DownloadItem;
 class RenderProcessHost;
 class RenderWidgetHostView;
 class SiteInstance;
 }
 
 namespace extensions {
 class Extension;
 }
 
 // This class is the browser component of an extension component's RenderView.
@@ skipping 108 matching lines @@
       GetJavaScriptDialogCreator() OVERRIDE;
   virtual void RunFileChooser(
       content::WebContents* tab,
       const content::FileChooserParams& params) OVERRIDE;
   virtual void AddNewContents(content::WebContents* source,
                               content::WebContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture) OVERRIDE;
   virtual void CloseContents(content::WebContents* contents) OVERRIDE;
+  virtual void OnStartDownload(
+      content::WebContents* source,
+      content::DownloadItem* download) OVERRIDE;
 
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
   friend class ProcessCreationQueue;
 
   // Actually create the RenderView for this host. See CreateRenderViewSoon.
@@ skipping 72 matching lines @@
   // The relevant WebContents associated with this ExtensionHost, if any.
   content::WebContents* associated_web_contents_;
 
   // Used to measure how long it's been since the host was created.
   PerfTimer since_created_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_