Add explicit base to FilePath.

content/shell/shell_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_SHELL_SHELL_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_SHELL_SHELL_CONTENT_BROWSER_CLIENT_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 47 matching lines @@
     return resource_dispatcher_host_delegate_.get();
   }
   ShellBrowserMainParts* shell_browser_main_parts() {
     return shell_browser_main_parts_;
   }
 
  private:
   scoped_ptr<ShellResourceDispatcherHostDelegate>
       resource_dispatcher_host_delegate_;
 
-  FilePath webkit_source_dir_;
+  base::FilePath webkit_source_dir_;
 
   ShellBrowserMainParts* shell_browser_main_parts_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_CONTENT_BROWSER_CLIENT_H_