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

base/memory/shared_memory_handle_win.cc

Index: base/memory/shared_memory_handle_win.cc
diff --git a/base/memory/shared_memory_handle_win.cc b/base/memory/shared_memory_handle_win.cc
index a2ff91abd2c6c7cc7e2651e8ac90cf152dd5ad50..277a954daa1cd216c55c3b01333cc0fa4838d58a 100644
--- a/base/memory/shared_memory_handle_win.cc
+++ b/base/memory/shared_memory_handle_win.cc
@@ -30,18 +30,6 @@ SharedMemoryHandle& SharedMemoryHandle::operator=(
   return *this;
 }
 
-bool SharedMemoryHandle::operator==(const SharedMemoryHandle& handle) const {
-  // Invalid handles are always equal.
-  if (!IsValid() && !handle.IsValid())
-    return true;
-
-  return handle_ == handle.handle_ && pid_ == handle.pid_;
-}
-
-bool SharedMemoryHandle::operator!=(const SharedMemoryHandle& handle) const {
-  return !(*this == handle);
-}
-
 void SharedMemoryHandle::Close() const {
   DCHECK(handle_ != nullptr);
   DCHECK(BelongsToCurrentProcess());