Moves some files into mojo/common

mojo/common/scoped_message_pipe.h

 // Copyright 2013 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_SHELL_SCOPED_MESSAGE_PIPE_H_
-#define MOJO_SHELL_SCOPED_MESSAGE_PIPE_H_
+#ifndef MOJO_COMMON_SCOPED_MESSAGE_PIPE_H_
+#define MOJO_COMMON_SCOPED_MESSAGE_PIPE_H_
 
 #include "base/basictypes.h"
+#include "mojo/common/mojo_common_export.h"
 #include "mojo/public/system/core.h"
 
 namespace mojo {
-namespace shell {
+namespace common {
 
 // Simple scoper that creates a message pipe in constructor and closes it in
 // destructor. Test for success by comparing handles with MOJO_HANDLE_INVALID.
-class ScopedMessagePipe {
+class MOJO_COMMON_EXPORT ScopedMessagePipe {

[darin (slow to review), 2013/11/07 18:41:24]

This may end up being something we just want to have in public/utility/ since it
doesn't depend on base (public/system/macros.h also has a version of
DISALLOW_COPY_AND_ASSIGN). But, moving this here for now seems fine.

  public:
   ScopedMessagePipe();
   ~ScopedMessagePipe();
 
   MojoHandle handle_0() const { return handle_0_; }
   MojoHandle handle_1() const { return handle_1_; }
 
  private:
   MojoHandle handle_0_;
   MojoHandle handle_1_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedMessagePipe);
 };
 
-}  // namespace shell
+}  // namespace common
 }  // namespace mojo
 
-#endif  // MOJO_SHELL_SCOPED_MESSAGE_PIPE_H_
+#endif  // MOJO_COMMON_SCOPED_MESSAGE_PIPE_H_