blink_gc_plugin: retire overloaded traceImpl detection and handling.

tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl.h

 // 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.
 
 #ifndef TRACE_AFTER_DISPATCH_IMPL_H_
 #define TRACE_AFTER_DISPATCH_IMPL_H_
 
 #include "heap/stubs.h"
 
 namespace blink {
 
 class X : public GarbageCollected<X> {
  public:
   void Trace(Visitor*) {}
 };
 
 enum ClassTag {
   BASE, DERIVED
 };
 
 class TraceAfterDispatchInlinedBase
     : public GarbageCollected<TraceAfterDispatchInlinedBase> {
  public:
   explicit TraceAfterDispatchInlinedBase(ClassTag tag) : tag_(tag) {}
 
-  void Trace(Visitor* visitor) { TraceImpl(visitor); }
-  void Trace(InlinedGlobalMarkingVisitor visitor) { TraceImpl(visitor); }
+  void Trace(Visitor*);
 
-  void TraceAfterDispatch(Visitor* visitor) { TraceAfterDispatchImpl(visitor); }
-  void TraceAfterDispatch(InlinedGlobalMarkingVisitor visitor) {
-    TraceAfterDispatchImpl(visitor);
-  }
+  void TraceAfterDispatch(Visitor* visitor) { visitor->Trace(x_base_); }
 
  private:
-  template <typename VisitorDispatcher>
-  void TraceImpl(VisitorDispatcher visitor);
-
-  template <typename VisitorDispatcher>
-  void TraceAfterDispatchImpl(VisitorDispatcher visitor) {
-    visitor->Trace(x_base_);
-  }
-
   ClassTag tag_;
   Member<X> x_base_;
 };
 
 class TraceAfterDispatchInlinedDerived : public TraceAfterDispatchInlinedBase {
  public:
   TraceAfterDispatchInlinedDerived() : TraceAfterDispatchInlinedBase(DERIVED) {}
 
-  void TraceAfterDispatch(Visitor* visitor) { TraceAfterDispatchImpl(visitor); }
-  void TraceAfterDispatch(InlinedGlobalMarkingVisitor visitor) {
-    TraceAfterDispatchImpl(visitor);
-  }
-
- private:
-  template <typename VisitorDispatcher>
-  void TraceAfterDispatchImpl(VisitorDispatcher visitor) {
+  void TraceAfterDispatch(Visitor* visitor) {
     visitor->Trace(x_derived_);
     TraceAfterDispatchInlinedBase::TraceAfterDispatch(visitor);
   }
 
+ private:
   Member<X> x_derived_;
 };
 
 class TraceAfterDispatchExternBase
     : public GarbageCollected<TraceAfterDispatchExternBase> {
  public:
   explicit TraceAfterDispatchExternBase(ClassTag tag) : tag_(tag) {}
 
   void Trace(Visitor* visitor);
-  void Trace(InlinedGlobalMarkingVisitor visitor);
 
   void TraceAfterDispatch(Visitor* visitor);
-  void TraceAfterDispatch(InlinedGlobalMarkingVisitor visitor);
 
  private:
-  template <typename VisitorDispatcher>
-  void TraceImpl(VisitorDispatcher visitor);
-
-  template <typename VisitorDispatcher>
-  void TraceAfterDispatchImpl(VisitorDispatcher visitor);
-
   ClassTag tag_;
   Member<X> x_base_;
 };
 
 class TraceAfterDispatchExternDerived : public TraceAfterDispatchExternBase {
  public:
   TraceAfterDispatchExternDerived() : TraceAfterDispatchExternBase(DERIVED) {}
 
   void TraceAfterDispatch(Visitor* visitor);
-  void TraceAfterDispatch(InlinedGlobalMarkingVisitor visitor);
 
  private:
-  template <typename VisitorDispatcher>
-  void TraceAfterDispatchImpl(VisitorDispatcher visitor);
-
   Member<X> x_derived_;
 };
 
 }
 
 #endif  // TRACE_AFTER_DISPATCH_IMPL_H_