[heap] Remove unused traced_pending_phantom_callbacks_

Change-Id: I00acbcac8bbd86b502ef5d921bfcc9b2fa0f3860
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3816672
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82297}

src/handles/global-handles.cc

@@ -1453,8 +1453,7 @@ size_t GlobalHandles::InvokeFirstPassWeakCallbacks(
 }
 
 size_t GlobalHandles::InvokeFirstPassWeakCallbacks() {
-  return InvokeFirstPassWeakCallbacks(&regular_pending_phantom_callbacks_) +
-         InvokeFirstPassWeakCallbacks(&traced_pending_phantom_callbacks_);
+  return InvokeFirstPassWeakCallbacks(&regular_pending_phantom_callbacks_);
 }
 
 void GlobalHandles::PendingPhantomCallback::Invoke(Isolate* isolate,

src/handles/global-handles.h

@@ -217,8 +217,6 @@ class V8_EXPORT_PRIVATE GlobalHandles final {
 
   std::vector<std::pair<Node*, PendingPhantomCallback>>
       regular_pending_phantom_callbacks_;
-  std::vector<std::pair<TracedNode*, PendingPhantomCallback>>
-      traced_pending_phantom_callbacks_;
   std::vector<PendingPhantomCallback> second_pass_callbacks_;
   bool second_pass_callbacks_task_posted_ = false;
 };