diff --git a/platform/platform-impl/src/com/intellij/ide/IdeEventQueue.java b/platform/platform-impl/src/com/intellij/ide/IdeEventQueue.java
index d88b36a2e51d..2ab92722284d 100644
--- a/platform/platform-impl/src/com/intellij/ide/IdeEventQueue.java
+++ b/platform/platform-impl/src/com/intellij/ide/IdeEventQueue.java
@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.ide;
 
 import com.intellij.ide.actions.MaximizeActiveDialogAction;
@@ -257,16 +243,8 @@ public class IdeEventQueue extends EventQueue {
     }
   }
 
-  public void addActivityListener(@NotNull final Runnable runnable, @NotNull Disposable parentDisposable) {
-    synchronized (myLock) {
-      ContainerUtil.add(runnable, myActivityListeners, parentDisposable);
-    }
-  }
-
-  public void removeActivityListener(@NotNull final Runnable runnable) {
-    synchronized (myLock) {
-      myActivityListeners.remove(runnable);
-    }
+  public void addActivityListener(@NotNull Runnable runnable, @NotNull Disposable parentDisposable) {
+    ContainerUtil.add(runnable, myActivityListeners, parentDisposable);
   }
 
   public void addDispatcher(@NotNull EventDispatcher dispatcher, Disposable parent) {