Implement a salt for MediaSource IDs that can be cleared by a user.

content/test/test_content_browser_client.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_TEST_TEST_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_TEST_TEST_CONTENT_BROWSER_CLIENT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/files/scoped_temp_dir.h"
 #include "content/public/browser/content_browser_client.h"
 
 namespace content {
 
 // Base for unit tests that need a ContentBrowserClient.
 class TestContentBrowserClient : public ContentBrowserClient {
  public:
   TestContentBrowserClient();
   virtual ~TestContentBrowserClient();
 
   virtual WebContentsViewPort* OverrideCreateWebContentsView(
       WebContents* web_contents,
       RenderViewHostDelegateView** render_view_host_delegate_view) OVERRIDE;
   virtual base::FilePath GetDefaultDownloadDirectory() OVERRIDE;
+  virtual std::string GetMediaDeviceIDSalt(ResourceContext* rc) OVERRIDE;
 
  private:
   // Temporary directory for GetDefaultDownloadDirectory.
   base::ScopedTempDir download_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(TestContentBrowserClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_CONTENT_BROWSER_CLIENT_H_