Allow events in queue to coalesce while executing other events.

content/renderer/input/main_thread_event_queue_task_list.h

Index: content/renderer/input/main_thread_event_queue_task_list.h
diff --git a/content/renderer/input/main_thread_event_queue_task_list.h b/content/renderer/input/main_thread_event_queue_task_list.h
index 9d46a61007e2438c4fd64a9023eb1852d42f18d1..b9a81d2ad98ab0c80e73b07001be6419a4e6a2ef 100644
--- a/content/renderer/input/main_thread_event_queue_task_list.h
+++ b/content/renderer/input/main_thread_event_queue_task_list.h
@@ -31,13 +31,6 @@ class MainThreadEventQueueTaskList {
     return queue_.at(pos);
   }
 
-  void emplace_front(std::unique_ptr<MainThreadEventQueueTask> event) {
-    queue_.emplace_front(std::move(event));
-  }
-  void swap(std::deque<std::unique_ptr<MainThreadEventQueueTask>>* queue) {
-    queue_.swap(*queue);
-  }
-
   bool empty() const { return queue_.empty(); }
 
   size_t size() const { return queue_.size(); }