src: use smart pointer instead of new and delete

Use an std::unique_ptr for variables that are deleted
right after creation.

Since the destructor of InspectorTimer is private
but needed by the unique_ptr, define deleter_type as friend.

PR-URL: #17020
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>

src/inspector_agent.cc

@@ -261,17 +261,19 @@ class InspectorTimer {
   }
 
   static void TimerClosedCb(uv_handle_t* uvtimer) {
-    InspectorTimer* timer =
+    std::unique_ptr<InspectorTimer> timer(
         node::ContainerOf(&InspectorTimer::timer_,
-                          reinterpret_cast<uv_timer_t*>(uvtimer));
-    delete timer;
+                          reinterpret_cast<uv_timer_t*>(uvtimer)));
+    // Unique_ptr goes out of scope here and pointer is deleted.
   }
 
   ~InspectorTimer() {}
 
   uv_timer_t timer_;
   V8InspectorClient::TimerCallback callback_;
   void* data_;
+
+  friend std::unique_ptr<InspectorTimer>::deleter_type;
 };
 
 class InspectorTimerHandle {

src/inspector_io.cc

@@ -114,9 +114,9 @@ int CloseAsyncAndLoop(uv_async_t* async) {
 
 // Delete main_thread_req_ on async handle close
 void ReleasePairOnAsyncClose(uv_handle_t* async) {
-  AsyncAndAgent* pair = node::ContainerOf(&AsyncAndAgent::first,
-                                          reinterpret_cast<uv_async_t*>(async));
-  delete pair;
+  std::unique_ptr<AsyncAndAgent> pair(node::ContainerOf(&AsyncAndAgent::first,
+      reinterpret_cast<uv_async_t*>(async)));
+  // Unique_ptr goes out of scope here and pointer is deleted.
 }
 
 }  // namespace