Added ability to set ChromeDownloadManagerDelegate for testing.

chrome/browser/download/chrome_download_manager_delegate.h

Index: chrome/browser/download/chrome_download_manager_delegate.h
diff --git a/chrome/browser/download/chrome_download_manager_delegate.h b/chrome/browser/download/chrome_download_manager_delegate.h
index 3942c06604baf7ee3cae08d478fac890532cdc24..102385ea3023fb23d9efc8053563bbf64526ea8b 100644
--- a/chrome/browser/download/chrome_download_manager_delegate.h
+++ b/chrome/browser/download/chrome_download_manager_delegate.h
@@ -81,9 +81,16 @@ class ChromeDownloadManagerDelegate
   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_;
+
  private:
   friend class base::RefCountedThreadSafe<ChromeDownloadManagerDelegate>;
-  virtual ~ChromeDownloadManagerDelegate();
 
   // NotificationObserver implementation.
   virtual void Observe(int type,
@@ -122,7 +129,6 @@ class ChromeDownloadManagerDelegate
   void OnItemAddedToPersistentStore(int32 download_id, int64 db_handle);
 
   Profile* profile_;
-  scoped_refptr<DownloadManager> download_manager_;
   scoped_ptr<DownloadPrefs> download_prefs_;
   scoped_ptr<DownloadHistory> download_history_;