Remove all blimp client code.

blimp/client/public/android/java/src/org/chromium/blimp_public/contents/BlimpContentsObserver.java

Index: blimp/client/public/android/java/src/org/chromium/blimp_public/contents/BlimpContentsObserver.java
diff --git a/blimp/client/public/android/java/src/org/chromium/blimp_public/contents/BlimpContentsObserver.java b/blimp/client/public/android/java/src/org/chromium/blimp_public/contents/BlimpContentsObserver.java
deleted file mode 100644
index 7bdda3cbb3b8363e4d87dd08790e196a6f6c254c..0000000000000000000000000000000000000000
--- a/blimp/client/public/android/java/src/org/chromium/blimp_public/contents/BlimpContentsObserver.java
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2016 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.blimp_public.contents;
-
-/**
- * BlimpContentsObserver is the Java representation of a native BlimpContentsObserver object.
- *
- * The BlimpContentsObserver is an observer API implemented by classes which are interested in
- * various events related to {@link BlimpContents}.
- */
-public interface BlimpContentsObserver {
-    /**
-     * Invoked when the BlimpContents's navigation state is changed.
-     */
-    void onNavigationStateChanged();
-
-    /**
-     * Invoked when the BlimpContents starts or stops loading.
-     * @param loading Whether or not the BlimpContents is currently loading.
-     */
-    void onLoadingStateChanged(boolean loading);
-
-    /**
-     * Invoked when the BlimpContents starts or stops loading a page.
-     * @param loading Whether or not the BlimpContents is currently loading a page.
-     */
-    void onPageLoadingStateChanged(boolean loading);
-}