Disallow [in]equality operator for PageTransition

ui/base/page_transition_types.h

Index: ui/base/page_transition_types.h
diff --git a/ui/base/page_transition_types.h b/ui/base/page_transition_types.h
index eafea5237651e9513b2677804968c8d265a18a66..1d2d420834c2d55dca9b77bf8eb510a47c1cb240 100644
--- a/ui/base/page_transition_types.h
+++ b/ui/base/page_transition_types.h
@@ -186,19 +186,18 @@ UI_BASE_EXPORT bool PageTransitionIsWebTriggerable(PageTransition type);
 UI_BASE_EXPORT const char* PageTransitionGetCoreTransitionString(
     PageTransition type);
 
-// TODO(joth): Remove the #if guard here; requires all chrome layer code to
-// be fixed up not to use operator==
-#if defined(CONTENT_IMPLEMENTATION)
 // Declare a dummy class that is intentionally never defined.
 class DontUseOperatorEquals;
 
-// Ban operator== as it's way too easy to forget to strip the qualifiers. Use
-// PageTransitionCoreTypeIs() instead or, in rare cases,
+// Ban operator== and operator!= as it's way too easy to forget to strip the
+// qualifiers. Use PageTransitionCoreTypeIs() instead or, in rare cases,
 // PageTransitionTypeIncludingQualifiersIs().
 DontUseOperatorEquals operator==(PageTransition, PageTransition);
 DontUseOperatorEquals operator==(PageTransition, int);
 DontUseOperatorEquals operator==(int, PageTransition);
-#endif  // defined(CONTENT_IMPLEMENTATION)
+DontUseOperatorEquals operator!=(PageTransition, PageTransition);
+DontUseOperatorEquals operator!=(PageTransition, int);
+DontUseOperatorEquals operator!=(int, PageTransition);
 
 }  // namespace ui