[wrapper-tracing] Redesign dispatching on non-inheriting cases

third_party/WebKit/Source/platform/heap/GarbageCollected.h

Index: third_party/WebKit/Source/platform/heap/GarbageCollected.h
diff --git a/third_party/WebKit/Source/platform/heap/GarbageCollected.h b/third_party/WebKit/Source/platform/heap/GarbageCollected.h
index e22e0e1e0197f1ae3a03766ecf3ee409f8d86ec9..f914e023f52af8115bf7ed6f78b4c83c08a4b5d3 100644
--- a/third_party/WebKit/Source/platform/heap/GarbageCollected.h
+++ b/third_party/WebKit/Source/platform/heap/GarbageCollected.h
@@ -246,17 +246,6 @@ class NeedsAdjustAndMark<T, false> {
       IsGarbageCollectedMixin<typename std::remove_const<T>::type>::value;
 };
 
-class WrapperVisitor;
-template <typename T, typename = void>
-struct CanTraceWrappers : std::false_type {};
-
-template <typename T>
-struct CanTraceWrappers<T,
-                        decltype(
-                            std::declval<T&>().markAndDispatchTraceWrappers(
-                                std::declval<WrapperVisitor*>()))>
-    : std::true_type {};
-
 // TODO(sof): migrate to wtf/TypeTraits.h
 template <typename T>
 class IsFullyDefined {