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

base/memory/shared_memory_posix.cc

Index: base/memory/shared_memory_posix.cc
diff --git a/base/memory/shared_memory_posix.cc b/base/memory/shared_memory_posix.cc
index 997b3f46e0e0f8218e5c2a637614872b1b2a8a86..2032e26e8d80c82e4428de4f9f8ff334d505ec89 100644
--- a/base/memory/shared_memory_posix.cc
+++ b/base/memory/shared_memory_posix.cc
@@ -58,11 +58,6 @@ bool SharedMemory::IsHandleValid(const SharedMemoryHandle& handle) {
 }
 
 // static
-SharedMemoryHandle SharedMemory::NULLHandle() {
-  return SharedMemoryHandle();
-}
-
-// static
 void SharedMemory::CloseHandle(const SharedMemoryHandle& handle) {
   DCHECK(handle.IsValid());
   handle.Close();