Build shared_memory_mac.cc and shared_memory_handle_mac.cc for iOS

base/memory/shared_memory_handle.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 BASE_MEMORY_SHARED_MEMORY_HANDLE_H_
 #define BASE_MEMORY_SHARED_MEMORY_HANDLE_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
-#elif defined(OS_MACOSX) && !defined(OS_IOS)
+#elif defined(OS_MACOSX)
 #include <sys/types.h>
 #include "base/base_export.h"
 #include "base/file_descriptor_posix.h"
 #include "base/macros.h"
 #elif defined(OS_POSIX)
 #include <sys/types.h>
 #include "base/file_descriptor_posix.h"
 #endif
 
 namespace base {
 
 class Pickle;
 
 // SharedMemoryHandle is a platform specific type which represents
 // the underlying OS handle to a shared memory segment.
 #if defined(OS_WIN)
 typedef HANDLE SharedMemoryHandle;
-#elif defined(OS_POSIX) && !(defined(OS_MACOSX) && !defined(OS_IOS))
+#elif defined(OS_POSIX) && !defined(OS_MACOSX)
 typedef FileDescriptor SharedMemoryHandle;
 #else
 class BASE_EXPORT SharedMemoryHandle {
  public:
   enum Type {
     // Indicates that the SharedMemoryHandle is backed by a POSIX fd.
     POSIX,
     // Indicates that the SharedMemoryHandle is backed by the Mach primitive
     // "memory object".
     MACH,
@@ skipping 47 matching lines @@
 
  private:
   Type type_;
   FileDescriptor file_descriptor_;
 };
 #endif
 
 }  // namespace base
 
 #endif  // BASE_MEMORY_SHARED_MEMORY_HANDLE_H_