Created a DownloadManager interface, for use in unit tests..

chrome/browser/download/chrome_download_manager_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_CHROME_DOWNLOAD_MANAGER_DELEGATE_H_
 #define CHROME_BROWSER_DOWNLOAD_CHROME_DOWNLOAD_MANAGER_DELEGATE_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/task.h"
 #include "chrome/browser/safe_browsing/download_protection_service.h"
 #include "content/public/browser/download_manager_delegate.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class CrxInstaller;
 class DownloadHistory;
 class DownloadItem;
-class DownloadManager;
+class DownloadManagerInterface;
 class DownloadPrefs;
 class Profile;
 struct DownloadStateInfo;
 
 #if defined(COMPILER_GCC)
 namespace __gnu_cxx {
 
 template<>
 struct hash<CrxInstaller*> {
   std::size_t operator()(CrxInstaller* const& p) const {
     return reinterpret_cast<std::size_t>(p);
   }
 };
 
 }  // namespace __gnu_cxx
 #endif
 
 // This is the Chrome side helper for the download system.
 class ChromeDownloadManagerDelegate
     : public base::RefCountedThreadSafe<ChromeDownloadManagerDelegate>,
       public content::DownloadManagerDelegate,
       public content::NotificationObserver {
  public:
   explicit ChromeDownloadManagerDelegate(Profile* profile);
 
-  void SetDownloadManager(DownloadManager* dm);
+  void SetDownloadManager(DownloadManagerInterface* dm);
 
   // Returns true if the given item is for an extension download.
   static bool IsExtensionDownload(const DownloadItem* item);
 
   virtual void Shutdown() OVERRIDE;
   virtual bool ShouldStartDownload(int32 download_id) OVERRIDE;
   virtual void ChooseDownloadPath(TabContents* tab_contents,
                                   const FilePath& suggested_path,
                                   void* data) OVERRIDE;
   virtual bool OverrideIntermediatePath(DownloadItem* item,
@@ skipping 24 matching lines @@
 
   DownloadPrefs* download_prefs() { return download_prefs_.get(); }
   DownloadHistory* download_history() { return download_history_.get(); }
 
  protected:
   // So that test classes can inherit from this for override purposes.
   virtual ~ChromeDownloadManagerDelegate();
 
   // So that test classes that inherit from this for override purposes
   // can call back into the DownloadManager.
-  scoped_refptr<DownloadManager> download_manager_;
+  scoped_refptr<DownloadManagerInterface> download_manager_;
 
  private:
   friend class base::RefCountedThreadSafe<ChromeDownloadManagerDelegate>;
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Callback function after url is checked with safebrowsing service.
@@ skipping 43 matching lines @@
   // Maps from pending extension installations to DownloadItem IDs.
   typedef base::hash_map<CrxInstaller*, int> CrxInstallerMap;
   CrxInstallerMap crx_installers_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeDownloadManagerDelegate);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_CHROME_DOWNLOAD_MANAGER_DELEGATE_H_