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

ui/surface/transport_dib.h

Index: ui/surface/transport_dib.h
diff --git a/ui/surface/transport_dib.h b/ui/surface/transport_dib.h
index 3217b5ff8a663927af793dd61c5ab02c6f157c86..f067774232477e22bc03eb21f48156faf81f7984 100644
--- a/ui/surface/transport_dib.h
+++ b/ui/surface/transport_dib.h
@@ -34,12 +34,6 @@ class SURFACE_EXPORT TransportDIB {
 // side can map the transport DIB.
   typedef base::SharedMemoryHandle Handle;
 
-  // Returns a default, invalid handle, that is meant to indicate a missing
-  // Transport DIB.
-  static Handle DefaultHandleValue() {
-    return base::SharedMemory::NULLHandle();
-  }
-
   // Create a new TransportDIB, returning NULL on failure.
   //
   // The size is the minimum size in bytes of the memory backing the transport