Bug 483118 - navigator.platform should return Win64 instead of Win32 or Windows NT. r+sr=peterv

dom/base/nsGlobalWindow.cpp

@@ -9068,7 +9068,9 @@ nsNavigator::GetPlatform(nsAString& aPlatform)
     // sorry for the #if platform ugliness, but Communicator is
     // likewise hardcoded and we're seeking backward compatibility
     // here (bug 47080)
-#if defined(WIN32)
+#if defined(_WIN64)
+    aPlatform.AssignLiteral("Win64");
+#elif defined(WIN32)
     aPlatform.AssignLiteral("Win32");
 #elif defined(XP_MACOSX) && defined(__ppc__)
     aPlatform.AssignLiteral("MacPPC");