blink_gc_plugin: retire overloaded traceImpl detection and handling.

tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "trace_after_dispatch_impl.h"
 
 namespace blink {
 
-template <typename VisitorDispatcher>
-inline void TraceAfterDispatchInlinedBase::TraceImpl(
-    VisitorDispatcher visitor) {
+void TraceAfterDispatchInlinedBase::Trace(Visitor* visitor) {
   // Implement a simple form of manual dispatching, because BlinkGCPlugin
   // checks if the tracing is dispatched to all derived classes.
   //
   // This function has to be implemented out-of-line, since we need to know the
   // definition of derived classes here.
   if (tag_ == DERIVED) {
     static_cast<TraceAfterDispatchInlinedDerived*>(this)->TraceAfterDispatch(
         visitor);
   } else {
     TraceAfterDispatch(visitor);
   }
 }
 
 void TraceAfterDispatchExternBase::Trace(Visitor* visitor) {
-  TraceImpl(visitor);
-}
-
-void TraceAfterDispatchExternBase::Trace(InlinedGlobalMarkingVisitor visitor) {
-  TraceImpl(visitor);
-}
-
-template <typename VisitorDispatcher>
-inline void TraceAfterDispatchExternBase::TraceImpl(VisitorDispatcher visitor) {
   if (tag_ == DERIVED) {
     static_cast<TraceAfterDispatchExternDerived*>(this)->TraceAfterDispatch(
         visitor);
   } else {
     TraceAfterDispatch(visitor);
   }
 }
 
 void TraceAfterDispatchExternBase::TraceAfterDispatch(Visitor* visitor) {
-  TraceAfterDispatchImpl(visitor);
-}
-
-void TraceAfterDispatchExternBase::TraceAfterDispatch(
-    InlinedGlobalMarkingVisitor visitor) {
-  TraceAfterDispatchImpl(visitor);
-}
-
-template <typename VisitorDispatcher>
-inline void TraceAfterDispatchExternBase::TraceAfterDispatchImpl(
-    VisitorDispatcher visitor) {
   visitor->Trace(x_base_);
 }
 
 void TraceAfterDispatchExternDerived::TraceAfterDispatch(Visitor* visitor) {
-  TraceAfterDispatchImpl(visitor);
-}
-
-void TraceAfterDispatchExternDerived::TraceAfterDispatch(
-    InlinedGlobalMarkingVisitor visitor) {
-  TraceAfterDispatchImpl(visitor);
-}
-
-template <typename VisitorDispatcher>
-inline void TraceAfterDispatchExternDerived::TraceAfterDispatchImpl(
-    VisitorDispatcher visitor) {
   visitor->Trace(x_derived_);
   TraceAfterDispatchExternBase::TraceAfterDispatch(visitor);
 }
 
 }