Fix license headers in a number of files

ppapi/native_client/src/shared/ppapi_proxy/browser_ppp_instance.h

-// Copyright 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.
+// 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 NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_INSTANCE_H_
 #define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_INSTANCE_H_
 
 #include "native_client/src/include/nacl_macros.h"
 // Needed because ppp_instance.h does not include everything it needs.
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppp_instance.h"
 
 namespace ppapi_proxy {
 
 // Implements the trusted side of the PPP_Instance interface.
 class BrowserInstance {
  public:
   static const PPP_Instance* GetInterface();
 
  private:
   NACL_DISALLOW_COPY_AND_ASSIGN(BrowserInstance);
 };
 
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_INSTANCE_H_