src: stop overriding deprecated V8 methods

These methods will be removed in V8 8.1, hence we need to stop
overriding them.

PR-URL: #32116
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

src/node_platform.h

@@ -149,14 +149,6 @@ class NodePlatform : public MultiIsolatePlatform {
   void CallOnWorkerThread(std::unique_ptr<v8::Task> task) override;
   void CallDelayedOnWorkerThread(std::unique_ptr<v8::Task> task,
                                  double delay_in_seconds) override;
-  void CallOnForegroundThread(v8::Isolate* isolate, v8::Task* task) override {
-    UNREACHABLE();
-  }
-  void CallDelayedOnForegroundThread(v8::Isolate* isolate,
-                                     v8::Task* task,
-                                     double delay_in_seconds) override {
-    UNREACHABLE();
-  }
   bool IdleTasksEnabled(v8::Isolate* isolate) override;
   double MonotonicallyIncreasingTime() override;
   double CurrentClockTimeMillis() override;