Bug 798355 - Remove the base class conversion operator from MachMsgPortDescriptor because it will never be used; r=cjones

--HG--
extra : rebase_source : d0941e3296856a871d8226b51888f086efd559c4

ipc/chromium/src/chrome/common/mach_ipc_mac.h

@@ -111,12 +111,6 @@ class MachMsgPortDescriptor : public mach_msg_port_descriptor_t {
     return disposition;
   }
 
-  // We're just a simple wrapper for mach_msg_port_descriptor_t
-  // and have the same memory layout
-  operator mach_msg_port_descriptor_t&() {
-    return *this;
-  }
-
   // For convenience
   operator mach_port_t() const {
     return GetMachPort();