Put the Pepper stuff in the content namespace.

content/renderer/pepper/pepper_proxy_channel_delegate_impl.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_RENDERER_PEPPER_PEPPER_PROXY_CHANNEL_DELEGATE_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PROXY_CHANNEL_DELEGATE_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "ppapi/proxy/proxy_channel.h"
 
+namespace content {
+
 class PepperProxyChannelDelegateImpl
     : public ppapi::proxy::ProxyChannel::Delegate {
  public:
   virtual ~PepperProxyChannelDelegateImpl();
 
   // ProxyChannel::Delegate implementation.
   virtual base::MessageLoopProxy* GetIPCMessageLoop() OVERRIDE;
   virtual base::WaitableEvent* GetShutdownEvent() OVERRIDE;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PROXY_CHANNEL_DELEGATE_IMPL_H_