Revert of Make SharedMemoryHandle a class on Mac.

ipc/ipc_message_utils.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 IPC_IPC_MESSAGE_UTILS_H_
 #define IPC_IPC_MESSAGE_UTILS_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 39 matching lines @@
 namespace base {
 class DictionaryValue;
 class FilePath;
 class ListValue;
 class NullableString16;
 class Time;
 class TimeDelta;
 class TimeTicks;
 class TraceTicks;
 struct FileDescriptor;
-
-#if defined(OS_MACOSX) && !defined(OS_IOS)
-class SharedMemoryHandle;
-#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 }
 
 namespace IPC {
 
 struct ChannelHandle;
 
 // -----------------------------------------------------------------------------
 // How we send IPC message logs across channels.
 struct IPC_EXPORT LogData {
   LogData();
@@ skipping 390 matching lines @@
 struct IPC_EXPORT ParamTraits<base::FileDescriptor> {
   typedef base::FileDescriptor param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m,
                    base::PickleIterator* iter,
                    param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 #endif  // defined(OS_POSIX)
 
-#if defined(OS_MACOSX) && !defined(OS_IOS)
-template <>
-struct IPC_EXPORT ParamTraits<base::SharedMemoryHandle> {
-  typedef base::SharedMemoryHandle param_type;
-  static void Write(Message* m, const param_type& p);
-  static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
-  static void Log(const param_type& p, std::string* l);
-};
-#endif
-
 template <>
 struct IPC_EXPORT ParamTraits<base::FilePath> {
   typedef base::FilePath param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m,
                    base::PickleIterator* iter,
                    param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
@@ skipping 516 matching lines @@
   template <typename... Ts>
   static void WriteReplyParams(Message* reply, Ts... args) {
     ReplyParam p(args...);
     WriteParam(reply, p);
   }
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_H_