Use a fresh, temporary profile when running content_shell in DRT mode

content/shell/shell_browser_context.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 CONTENT_SHELL_SHELL_BROWSER_CONTEXT_H_
 #define CONTENT_SHELL_SHELL_BROWSER_CONTEXT_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/scoped_temp_dir.h"
 #include "content/public/browser/browser_context.h"
 
 namespace content {
 
 class DownloadManagerDelegate;
 class ResourceContext;
 class ShellBrowserMainParts;
 class ShellDownloadManagerDelegate;
 
 class ShellBrowserContext : public BrowserContext {
@@ skipping 15 matching lines @@
   virtual SpeechRecognitionPreferences*
       GetSpeechRecognitionPreferences() OVERRIDE;
   virtual bool DidLastSessionExitCleanly() OVERRIDE;
   virtual quota::SpecialStoragePolicy* GetSpecialStoragePolicy() OVERRIDE;
 
  private:
   // Performs initialization of the ShellBrowserContext while IO is still
   // allowed on the current thread.
   void InitWhileIOAllowed();
 
+  ScopedTempDir testing_path_;
   FilePath path_;
   scoped_ptr<ResourceContext> resource_context_;
   scoped_refptr<ShellDownloadManagerDelegate> download_manager_delegate_;
   scoped_refptr<net::URLRequestContextGetter> url_request_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellBrowserContext);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_BROWSER_CONTEXT_H_