Added ability to set ChromeDownloadManagerDelegate for testing.

chrome/browser/profiles/profile_impl.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/profiles/profile_impl.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
 #include "base/file_path.h"
@@ skipping 1246 matching lines @@
 
   if (!ps || !ps->Init()) {
     NOTREACHED() << "Could not initialize password manager.";
     return;
   }
   password_store_.swap(ps);
 }
 
 DownloadManager* ProfileImpl::GetDownloadManager() {
   if (!created_download_manager_) {
-    download_manager_delegate_= new ChromeDownloadManagerDelegate(this);
+    // In case the delegate has already been set by SetDownloadManagerDelegate.
+    if (!download_manager_delegate_.get())
+      download_manager_delegate_= new ChromeDownloadManagerDelegate(this);
     scoped_refptr<DownloadManager> dlm(
         new DownloadManager(download_manager_delegate_,
                             g_browser_process->download_status_updater()));
     dlm->Init(this);
     download_manager_delegate_->SetDownloadManager(dlm);
     created_download_manager_ = true;
     download_manager_.swap(dlm);
   }
   return download_manager_.get();
 }
@@ skipping 450 matching lines @@
 #endif
   }
   return prerender_manager_.get();
 }
 
 SpellCheckProfile* ProfileImpl::GetSpellCheckProfile() {
   if (!spellcheck_profile_.get())
     spellcheck_profile_.reset(new SpellCheckProfile());
   return spellcheck_profile_.get();
 }
+
+void ProfileImpl::SetDownloadManagerDelegate(
+    ChromeDownloadManagerDelegate* delegate) {
+  download_manager_delegate_ = delegate;
+}