Move more Mojo bindings helpers out of internal namespace

mojo/public/cpp/bindings/pipe_control_message_proxy.h

 // Copyright 2015 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 MOJO_PUBLIC_CPP_BINDINGS_LIB_PIPE_CONTROL_MESSAGE_PROXY_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_PIPE_CONTROL_MESSAGE_PROXY_H_
+#ifndef MOJO_PUBLIC_CPP_BINDINGS_PIPE_CONTROL_MESSAGE_PROXY_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_PIPE_CONTROL_MESSAGE_PROXY_H_
 
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/interface_id.h"
 #include "mojo/public/cpp/bindings/lib/serialization_context.h"
 
 namespace mojo {
 
 class MessageReceiver;
 
-namespace internal {
-
 // Proxy for request messages defined in pipe_control_messages.mojom.
 class PipeControlMessageProxy {
  public:
   // Doesn't take ownership of |receiver|. It must outlive this object.
   explicit PipeControlMessageProxy(MessageReceiver* receiver);
 
   void NotifyPeerEndpointClosed(InterfaceId id);
   void NotifyEndpointClosedBeforeSent(InterfaceId id);
 
  private:
   // Not owned.
   MessageReceiver* receiver_;
-  SerializationContext context_;
+  internal::SerializationContext context_;
 
   DISALLOW_COPY_AND_ASSIGN(PipeControlMessageProxy);
 };
 
-}  // namespace internal
 }  // namespace mojo
 
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_PIPE_CONTROL_MESSAGE_PROXY_H_
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_PIPE_CONTROL_MESSAGE_PROXY_H_