Move some download tests to content from chrome.

content/shell/shell_browser_context.cc

 // 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.
 
 #include "content/shell/shell_browser_context.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/file_util.h"
@@ skipping 67 matching lines @@
   return path_;
 }
 
 bool ShellBrowserContext::IsOffTheRecord() const {
   return off_the_record_;
 }
 
 DownloadManagerDelegate* ShellBrowserContext::GetDownloadManagerDelegate()  {
   DownloadManager* manager = BrowserContext::GetDownloadManager(this);
 
-  download_manager_delegate_ = new ShellDownloadManagerDelegate();
-  download_manager_delegate_->SetDownloadManager(manager);
+  if (!download_manager_delegate_.get()) {
+    download_manager_delegate_ = new ShellDownloadManagerDelegate();
+    download_manager_delegate_->SetDownloadManager(manager);
+  }
 
   return download_manager_delegate_.get();
 }
 
 net::URLRequestContextGetter* ShellBrowserContext::GetRequestContext()  {
   if (!url_request_getter_) {
     url_request_getter_ = new ShellURLRequestContextGetter(
         GetPath(),
         BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::IO),
         BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::FILE));
@@ skipping 38 matching lines @@
 
 bool ShellBrowserContext::DidLastSessionExitCleanly()  {
   return true;
 }
 
 quota::SpecialStoragePolicy* ShellBrowserContext::GetSpecialStoragePolicy() {
   return NULL;
 }
 
 }  // namespace content