blink_gc_plugin: retire overloaded traceImpl detection and handling.

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

Index: tools/clang/blink_gc_plugin/tests/legacy_naming/register_weak_members_template.h
diff --git a/tools/clang/blink_gc_plugin/tests/legacy_naming/register_weak_members_template.h b/tools/clang/blink_gc_plugin/tests/legacy_naming/register_weak_members_template.h
index 7d3905a51df2b02663e69f6f64777d3c0d5d2988..4df3adebdddefd509505faecf4529d8c52f179ee 100644
--- a/tools/clang/blink_gc_plugin/tests/legacy_naming/register_weak_members_template.h
+++ b/tools/clang/blink_gc_plugin/tests/legacy_naming/register_weak_members_template.h
@@ -11,30 +11,20 @@ namespace blink {
 
 class X : public GarbageCollected<X> {
  public:
-  void trace(Visitor* visitor) { traceImpl(visitor); }
-  void trace(InlinedGlobalMarkingVisitor visitor) { traceImpl(visitor); }
-
- private:
-  template <typename VisitorDispatcher>
-  void traceImpl(VisitorDispatcher visitor) {}
+  void trace(Visitor*) {}
 };
 
 class HasUntracedWeakMembers : public GarbageCollected<HasUntracedWeakMembers> {
  public:
-  void trace(Visitor* visitor) { traceImpl(visitor); }
-  void trace(InlinedGlobalMarkingVisitor visitor) { traceImpl(visitor); }
+  void trace(Visitor* visitor) {
+    visitor->registerWeakMembers<HasUntracedWeakMembers,
+                                 &HasUntracedWeakMembers::clearWeakMembers>(
+        this);
+  }
 
-  // Don't have to be defined for the purpose of this test.
   void clearWeakMembers(Visitor* visitor);
 
  private:
-  template <typename VisitorDispatcher>
-  void traceImpl(VisitorDispatcher visitor) {
-    visitor->template registerWeakMembers<
-        HasUntracedWeakMembers,
-        &HasUntracedWeakMembers::clearWeakMembers>(this);
-  }
-
   WeakMember<X> x_;
 };