ui: Cleanup class/struct forward declarations

blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/EmptySettingsObserver.java

Index: blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/EmptySettingsObserver.java
diff --git a/blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/EmptySettingsObserver.java b/blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/EmptySettingsObserver.java
new file mode 100644
index 0000000000000000000000000000000000000000..dae42a56f3a5d8f88b8246eea4b6c70f078a155d
--- /dev/null
+++ b/blimp/client/core/settings/android/java/src/org/chromium/blimp/core/settings/EmptySettingsObserver.java
@@ -0,0 +1,24 @@
+// 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.core.settings;
+
+/**
+ * EmptySettingsObserver is a helper class that has an empty implementation of all the
+ * methods in the {@link SettingsObserver}. It is intented to be used by every class that
+ * does not need to implement all the observer-methods.
+ */
+public class EmptySettingsObserver implements SettingsObserver {
+    @Override
+    public void onBlimpModeEnabled(boolean enable) {}
+
+    @Override
+    public void onShowNetworkStatsChanged(boolean enable) {}
+
+    @Override
+    public void onRecordWholeDocumentChanged(boolean enable) {}
+
+    @Override
+    public void onRestartRequired() {}
+}