[Android] Refactor: move files to chrome/browser/notifications/channels

chrome/android/junit/src/org/chromium/chrome/browser/notifications/ChannelDefinitionsTest.java

-// Copyright 2017 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.chrome.browser.notifications;
-
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.Matchers.everyItem;
-import static org.hamcrest.Matchers.isIn;
-import static org.hamcrest.Matchers.not;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.junit.runners.BlockJUnit4ClassRunner;
-
-/**
- * Java unit tests for ChannelDefinitions.
- */
-@RunWith(BlockJUnit4ClassRunner.class)
-public class ChannelDefinitionsTest {
-    @Test
-    public void testNoOverlapBetweenStartupAndLegacyChannelIds() throws Exception {
-        ChannelDefinitions channelDefinitions = new ChannelDefinitions();
-        assertThat(channelDefinitions.getStartupChannelIds(),
-                everyItem(not(isIn(channelDefinitions.getLegacyChannelIds()))));
-    }
-}