blink_gc_plugin: retire overloaded traceImpl detection and handling.

tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl.cpp

Index: tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl.cpp b/tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl.cpp
index 17bd1f8b3867626f5484fc52f5355cca82c4077c..c8cd1dfc95fb9879fd171d2c8812f4362b77f2e3 100644
--- a/tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl.cpp
+++ b/tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl.cpp
@@ -6,9 +6,7 @@
 
 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.
   //
@@ -23,15 +21,6 @@ inline void TraceAfterDispatchInlinedBase::TraceImpl(
 }
 
 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);
@@ -41,32 +30,10 @@ inline void TraceAfterDispatchExternBase::TraceImpl(VisitorDispatcher 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);
 }