cppgc: Remove deprecated Trace() method for raw pointers

Bug: v8:13089
Change-Id: Ic1c5a596adb822494aff490e04bd23cf84fb53f6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3840295
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82582}

include/cppgc/visitor.h

@@ -62,17 +62,6 @@ class V8_EXPORT Visitor {
 
   virtual ~Visitor() = default;
 
-  /**
-   * Trace method for raw pointers. Prefer the versions for managed pointers.
-   *
-   * \param member Reference retaining an object.
-   */
-  template <typename T>
-  V8_DEPRECATED("Do not use Trace() with raw pointers.")
-  void Trace(const T* t) {
-    TraceImpl(t);
-  }
-
   /**
    * Trace method for Member.
    *