Get rid of base::SharedMemory::NULLHandle();

base/memory/shared_memory_handle_mac.cc

 // 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.
 
 #include "base/memory/shared_memory_handle.h"
 
 #include <mach/mach_vm.h>
 #include <stddef.h>
 #include <sys/mman.h>
 #include <unistd.h>
@@ skipping 73 matching lines @@
       kern_return_t kr = mach_port_mod_refs(mach_task_self(), memory_object_,
                                             MACH_PORT_RIGHT_SEND, 1);
       DCHECK_EQ(kr, KERN_SUCCESS);
       SharedMemoryHandle handle(*this);
       handle.SetOwnershipPassesToIPC(true);
       return handle;
     }
   }
 }
 
-bool SharedMemoryHandle::operator==(const SharedMemoryHandle& handle) const {
-  if (!IsValid() && !handle.IsValid())
-    return true;
-
-  if (type_ != handle.type_)
-    return false;
-
-  switch (type_) {
-    case POSIX:
-      return file_descriptor_.fd == handle.file_descriptor_.fd;
-    case MACH:
-      return memory_object_ == handle.memory_object_ && size_ == handle.size_ &&
-             pid_ == handle.pid_;
-  }
-}
-
-bool SharedMemoryHandle::operator!=(const SharedMemoryHandle& handle) const {
-  return !(*this == handle);
-}
-
 bool SharedMemoryHandle::IsValid() const {
   switch (type_) {
     case POSIX:
       return file_descriptor_.fd >= 0;
     case MACH:
       return memory_object_ != MACH_PORT_NULL;
   }
 }
 
 mach_port_t SharedMemoryHandle::GetMemoryObject() const {
@@ skipping 86 matching lines @@
     case MACH:
       memory_object_ = handle.memory_object_;
       size_ = handle.size_;
       pid_ = handle.pid_;
       ownership_passes_to_ipc_ = handle.ownership_passes_to_ipc_;
       break;
   }
 }
 
 }  // namespace base