Bug 1208371 - Implement operator!= for nsMainThreadPtrHandle. r=bholley

MozReview-Commit-ID: EjlvLi9VsFA

--HG--
extra : rebase_source : 0e58b99b3c03a4abc4dfbcd57662f761f701615e

xpcom/glue/nsProxyRelease.h

@@ -272,6 +272,10 @@ public:
     }
     return *mPtr == *aOther.mPtr;
   }
+  bool operator!=(const nsMainThreadPtrHandle<T>& aOther) const
+  {
+    return !operator==(aOther);
+  }
   bool operator!() const {
     return !mPtr || !*mPtr;
   }