Cleanup blimp/client/core code organization.

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

Index: blimp/client/core/android/java/src/org/chromium/blimp/core/settings/PreferencesUtil.java
diff --git a/blimp/client/core/android/java/src/org/chromium/blimp/core/settings/PreferencesUtil.java b/blimp/client/core/android/java/src/org/chromium/blimp/core/settings/PreferencesUtil.java
deleted file mode 100644
index d441297fdb5c7e562a4b37b83cb83a6de9545c23..0000000000000000000000000000000000000000
--- a/blimp/client/core/android/java/src/org/chromium/blimp/core/settings/PreferencesUtil.java
+++ /dev/null
@@ -1,44 +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.core.settings;
-
-import org.chromium.base.ContextUtils;
-
-/**
- * Blimp preferences utilities.
- */
-public class PreferencesUtil {
-    /**
-     * Blimp switch preference key, also the key for this PreferenceFragment.
-     */
-    public static final String PREF_BLIMP_SWITCH = "blimp_switch";
-    /**
-     * Blimp assigner URL preference key.
-     */
-    public static final String PREF_ASSIGNER_URL = "blimp_assigner_url";
-
-    /**
-     * Default assigner URL.
-     */
-    public static final String DEFAULT_ASSIGNER_URL =
-            "https://dev-blimp-pa.sandbox.googleapis.com/v1/assignment";
-
-    /**
-     * Reads the last used assigner from shared preference.
-     * @return The saved value of assigner preference, or the default development assigner URL
-     * if we didn't find the shared preference.
-     */
-    public static String getLastUsedAssigner() {
-        return ContextUtils.getAppSharedPreferences().getString(
-                PREF_ASSIGNER_URL, DEFAULT_ASSIGNER_URL);
-    }
-
-    /**
-     * @return If Blimp switch preference in the setting page is turned on.
-     */
-    public static boolean isBlimpEnabled() {
-        return ContextUtils.getAppSharedPreferences().getBoolean(PREF_BLIMP_SWITCH, false);
-    }
-}