Use DownloadManager to initiate downloads from PluginInstaller.

chrome/browser/plugins/plugin_installer.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_PLUGINS_PLUGIN_INSTALLER_H_
 #define CHROME_BROWSER_PLUGINS_PLUGIN_INSTALLER_H_
 
+#include "base/gtest_prod_util.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "base/version.h"
 #include "chrome/browser/plugins/plugin_metadata.h"
 #include "content/public/browser/download_interrupt_reasons.h"
 #include "content/public/browser/download_item.h"
 #include "url/gurl.h"
 
 class PluginInstallerObserver;
 class WeakPluginInstallerObserver;
 
 namespace content {
+class DownloadManager;
 class WebContents;
 struct WebPluginInfo;
 }
 
 class PluginInstaller : public content::DownloadItem::Observer {
  public:
   enum InstallerState {
     INSTALLER_STATE_IDLE,
     INSTALLER_STATE_DOWNLOADING,
   };
@@ skipping 15 matching lines @@
   // Opens the download URL in a new tab.
   void OpenDownloadURL(const GURL& plugin_url,
                        content::WebContents* web_contents);
 
   // Starts downloading the download URL and opens the downloaded file
   // when finished.
   void StartInstalling(const GURL& plugin_url,
                        content::WebContents* web_contents);
 
  private:
+  void StartInstallingWithDownloadManager(
+      const GURL& plugin_url,
+      content::WebContents* web_contents,
+      content::DownloadManager* download_manager);
   void DownloadStarted(content::DownloadItem* item,
                        content::DownloadInterruptReason interrupt_reason);
   void DownloadError(const std::string& msg);
   void DownloadCancelled();
 
   InstallerState state_;
   ObserverList<PluginInstallerObserver> observers_;
   int strong_observer_count_;
   ObserverList<WeakPluginInstallerObserver> weak_observers_;
 
+  FRIEND_TEST_ALL_PREFIXES(PluginInstallerTest,
+                           StartInstalling_SuccessfulDownload);
+  FRIEND_TEST_ALL_PREFIXES(PluginInstallerTest, StartInstalling_FailedStart);
+  FRIEND_TEST_ALL_PREFIXES(PluginInstallerTest, StartInstalling_Interrupted);
   DISALLOW_COPY_AND_ASSIGN(PluginInstaller);
 };
 
 #endif  // CHROME_BROWSER_PLUGINS_PLUGIN_INSTALLER_H_