blink_gc_plugin: retire overloaded traceImpl detection and handling.

tools/clang/blink_gc_plugin/tests/legacy_naming/traceimpl_overloaded.h

Index: tools/clang/blink_gc_plugin/tests/legacy_naming/traceimpl_overloaded.h
diff --git a/tools/clang/blink_gc_plugin/tests/legacy_naming/traceimpl_overloaded.h b/tools/clang/blink_gc_plugin/tests/legacy_naming/traceimpl_overloaded.h
index 808821df452625706d5c9b23549a9fd0b7244b1a..34185a3998810ec33e9a1b9594eb50efbd307812 100644
--- a/tools/clang/blink_gc_plugin/tests/legacy_naming/traceimpl_overloaded.h
+++ b/tools/clang/blink_gc_plugin/tests/legacy_naming/traceimpl_overloaded.h
@@ -12,61 +12,40 @@ namespace blink {
 class X : public GarbageCollected<X> {
  public:
   void trace(Visitor*) {}
-  void trace(InlinedGlobalMarkingVisitor) {}
 };
 
 class InlinedBase : public GarbageCollected<InlinedBase> {
  public:
-  virtual void trace(Visitor* visitor) { traceImpl(visitor); }
-  virtual void trace(InlinedGlobalMarkingVisitor visitor) {
-    traceImpl(visitor);
-  }
+  virtual void trace(Visitor* visitor) { visitor->trace(x_base_); }
 
  private:
-  template <typename VisitorDispatcher>
-  void traceImpl(VisitorDispatcher visitor) { visitor->trace(x_base_); }
-
   Member<X> x_base_;
 };
 
 class InlinedDerived : public InlinedBase {
  public:
-  void trace(Visitor* visitor) override { traceImpl(visitor); }
-  void trace(InlinedGlobalMarkingVisitor visitor) override {
-    traceImpl(visitor);
-  }
-
- private:
-  template <typename VisitorDispatcher>
-  void traceImpl(VisitorDispatcher visitor) {
+  void trace(Visitor* visitor) override {
     visitor->trace(x_derived_);
     InlinedBase::trace(visitor);
   }
 
+ private:
   Member<X> x_derived_;
 };
 
 class ExternBase : public GarbageCollected<ExternBase> {
  public:
   virtual void trace(Visitor*);
-  virtual void trace(InlinedGlobalMarkingVisitor);
 
  private:
-  template <typename VisitorDispatcher>
-  void traceImpl(VisitorDispatcher);
-
   Member<X> x_base_;
 };
 
 class ExternDerived : public ExternBase {
  public:
   void trace(Visitor*) override;
-  void trace(InlinedGlobalMarkingVisitor) override;
 
  private:
-  template <typename VisitorDispatcher>
-  void traceImpl(VisitorDispatcher);
-
   Member<X> x_derived_;
 };