Share field trial allocator on Mac

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 <stddef.h>
 
 #include "build/build_config.h"
@@ skipping 103 matching lines @@
                      base::ProcessId pid);
 
   // Standard copy constructor. The new instance shares the underlying OS
   // primitives.
   SharedMemoryHandle(const SharedMemoryHandle& handle);
 
   // Standard assignment operator. The updated instance shares the underlying
   // OS primitives.
   SharedMemoryHandle& operator=(const SharedMemoryHandle& handle);
 
-  // Duplicates the underlying OS resources. Assumes the SharedMemoryHandle is
-  // of type MACH.
+  // Duplicates the underlying OS resources.
   SharedMemoryHandle Duplicate() const;
 
   // Comparison operators.
   bool operator==(const SharedMemoryHandle& handle) const;
   bool operator!=(const SharedMemoryHandle& handle) const;
 
   // Whether the underlying OS primitive is valid. Once the SharedMemoryHandle
   // is backed by a valid OS primitive, it becomes immutable.
   bool IsValid() const;
 
@@ skipping 47 matching lines @@
       // Defaults to |false|.
       bool ownership_passes_to_ipc_;
     };
   };
 };
 #endif
 
 }  // namespace base
 
 #endif  // BASE_MEMORY_SHARED_MEMORY_HANDLE_H_