Put the Pepper stuff in the content namespace.

content/renderer/pepper/pepper_proxy_channel_delegate_impl.h

Index: content/renderer/pepper/pepper_proxy_channel_delegate_impl.h
diff --git a/content/renderer/pepper/pepper_proxy_channel_delegate_impl.h b/content/renderer/pepper/pepper_proxy_channel_delegate_impl.h
index 1bffc2714d9f355ca783d5ad5468b5e3f613a4b1..94636a6e5fa0e2af7c133d6f6b3cb973f4d10d6e 100644
--- a/content/renderer/pepper/pepper_proxy_channel_delegate_impl.h
+++ b/content/renderer/pepper/pepper_proxy_channel_delegate_impl.h
@@ -8,6 +8,8 @@
 #include "base/compiler_specific.h"
 #include "ppapi/proxy/proxy_channel.h"
 
+namespace content {
+
 class PepperProxyChannelDelegateImpl
     : public ppapi::proxy::ProxyChannel::Delegate {
  public:
@@ -18,4 +20,6 @@ class PepperProxyChannelDelegateImpl
   virtual base::WaitableEvent* GetShutdownEvent() OVERRIDE;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PROXY_CHANNEL_DELEGATE_IMPL_H_