[wrapper-tracing] Simplify tracing by forbidding tracing from within mixins

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

Index: third_party/WebKit/Source/platform/heap/WrapperVisitor.h
diff --git a/third_party/WebKit/Source/platform/heap/WrapperVisitor.h b/third_party/WebKit/Source/platform/heap/WrapperVisitor.h
index 6315aadb89d13c60f56a362c0c240233109df65d..a4fc9770b40bf4d861284984759e290d0c61198d 100644
--- a/third_party/WebKit/Source/platform/heap/WrapperVisitor.h
+++ b/third_party/WebKit/Source/platform/heap/WrapperVisitor.h
@@ -154,14 +154,6 @@ class PLATFORM_EXPORT WrapperVisitor {
 
 #undef DECLARE_DISPATCH_TRACE_WRAPPERS
 
-  void dispatchTraceWrappers(const void*) const {
-    // This call should never be reached as we access all tracing through
-    // TraceTraits, which will check that we can dispatch at compile time.
-    // This handler is merely here to make adjustAndMarkWrapper compile
-    // for GarbageCollectedMixin objects.
-    NOTREACHED();
-  }
-
   virtual bool markWrapperHeader(HeapObjectHeader*) const = 0;
 
   virtual void markWrappersInAllWorlds(const ScriptWrappable*) const = 0;