Remove ContainerViewObserver class

content/public/android/java/src/org/chromium/content/browser/ContainerViewObserver.java

Index: content/public/android/java/src/org/chromium/content/browser/ContainerViewObserver.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContainerViewObserver.java b/content/public/android/java/src/org/chromium/content/browser/ContainerViewObserver.java
deleted file mode 100644
index 1ceb800a411fcf96db4847f681d9ca66087acbe8..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/ContainerViewObserver.java
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.content.browser;
-
-import android.view.ViewGroup;
-
-/**
- * Listener that is notified when the container view is replaced.
- * See {@link ContentViewCore#setContainerView} for additional details.
- */
-public abstract class ContainerViewObserver {
-    public void onContainerViewChanged(ViewGroup newContainerView) {
-        // Intentional no-op.
-    }
-}
-