[api] Remove long-deprecated static APIs to iterate persistent handles

Users should migrate to using the versions on Isolate.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I4fe956a4210308701f343a3a681d9d6f1b1f2d2b
Reviewed-on: https://chromium-review.googlesource.com/784832Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49566}

include/v8.h

@@ -8117,35 +8117,6 @@ class V8_EXPORT V8 {
       "Use isolate version",
       void VisitExternalResources(ExternalResourceVisitor* visitor));
 
-  /**
-   * Iterates through all the persistent handles in the current isolate's heap
-   * that have class_ids.
-   */
-  V8_INLINE static V8_DEPRECATED(
-      "Use isolate version",
-      void VisitHandlesWithClassIds(PersistentHandleVisitor* visitor));
-
-  /**
-   * Iterates through all the persistent handles in isolate's heap that have
-   * class_ids.
-   */
-  V8_INLINE static V8_DEPRECATED(
-      "Use isolate version",
-      void VisitHandlesWithClassIds(Isolate* isolate,
-                                    PersistentHandleVisitor* visitor));
-
-  /**
-   * Iterates through all the persistent handles in the current isolate's heap
-   * that have class_ids and are candidates to be marked as partially dependent
-   * handles. This will visit handles to young objects created since the last
-   * garbage collection but is free to visit an arbitrary superset of these
-   * objects.
-   */
-  V8_INLINE static V8_DEPRECATED(
-      "Use isolate version",
-      void VisitHandlesForPartialDependence(Isolate* isolate,
-                                            PersistentHandleVisitor* visitor));
-
   /**
    * Initialize the ICU library bundled with V8. The embedder should only
    * invoke this method when using the bundled ICU. Returns true on success.
@@ -10469,24 +10440,6 @@ void V8::VisitExternalResources(ExternalResourceVisitor* visitor) {
   isolate->VisitExternalResources(visitor);
 }
 
-
-void V8::VisitHandlesWithClassIds(PersistentHandleVisitor* visitor) {
-  Isolate* isolate = Isolate::GetCurrent();
-  isolate->VisitHandlesWithClassIds(visitor);
-}
-
-
-void V8::VisitHandlesWithClassIds(Isolate* isolate,
-                                  PersistentHandleVisitor* visitor) {
-  isolate->VisitHandlesWithClassIds(visitor);
-}
-
-
-void V8::VisitHandlesForPartialDependence(Isolate* isolate,
-                                          PersistentHandleVisitor* visitor) {
-  isolate->VisitHandlesForPartialDependence(visitor);
-}
-
 /**
  * \example shell.cc
  * A simple shell that takes a list of expressions on the