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

base/memory/shared_memory_handle.h

Index: base/memory/shared_memory_handle.h
diff --git a/base/memory/shared_memory_handle.h b/base/memory/shared_memory_handle.h
index 4af796bfa140a3f3c33f5506ea2a4aef9a625829..c0a016f5dcdd94d3b3b01ff89ec1f91c4e6035d6 100644
--- a/base/memory/shared_memory_handle.h
+++ b/base/memory/shared_memory_handle.h
@@ -83,10 +83,6 @@ class BASE_EXPORT SharedMemoryHandle {
                      mach_vm_size_t size,
                      base::ProcessId pid);
 
-  // Comparison operators.
-  bool operator==(const SharedMemoryHandle& handle) const;
-  bool operator!=(const SharedMemoryHandle& handle) const;
-
   // Duplicates the underlying OS resources.
   SharedMemoryHandle Duplicate() const;
 
@@ -106,10 +102,6 @@ class BASE_EXPORT SharedMemoryHandle {
 #elif defined(OS_WIN)
   SharedMemoryHandle(HANDLE h, base::ProcessId pid);
 
-  // Comparison operators.
-  bool operator==(const SharedMemoryHandle& handle) const;
-  bool operator!=(const SharedMemoryHandle& handle) const;
-
   // Whether |pid_| is the same as the current process's id.
   bool BelongsToCurrentProcess() const;