Convert WebappActivityTestBase and direct children to JUnit4.

chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappDeferredStartupTest.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.webapps;
 
 import android.support.test.filters.SmallTest;
 
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
 import org.chromium.base.test.util.CallbackHelper;
+import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Feature;
+import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.DeferredStartupHandler;
 import org.chromium.chrome.browser.tab.EmptyTabObserver;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tabmodel.EmptyTabModelSelectorObserver;
 import org.chromium.chrome.browser.tabmodel.TabModelSelectorBase;
+import org.chromium.chrome.test.ChromeActivityTestRule;
+import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
 
 /**
  * Tests that when WebappActivity#onDeferredStartup() is run, the activity tab has finished loading.
  */
-public class WebappDeferredStartupTest extends WebappActivityTestBase {
+@RunWith(ChromeJUnit4ClassRunner.class)
+@CommandLineFlags.Add({ChromeSwitches.DISABLE_FIRST_RUN_EXPERIENCE,
+        ChromeActivityTestRule.DISABLE_NETWORK_PREDICTION_FLAG})
+public class WebappDeferredStartupTest {
     static class PageLoadFinishedTabObserver extends EmptyTabObserver {
         private boolean mIsPageLoadFinished;
 
         @Override
         public void onPageLoadFinished(Tab tab) {
             mIsPageLoadFinished = true;
         }
 
         public boolean isPageLoadFinished() {
             return mIsPageLoadFinished;
@@ skipping 15 matching lines @@
 
     static class PageIsLoadedDeferredStartupHandler extends DeferredStartupHandler {
         public PageIsLoadedDeferredStartupHandler(PageLoadFinishedTabObserver observer,
                 CallbackHelper helper) {
             mObserver = observer;
             mHelper = helper;
         }
 
         @Override
         public void queueDeferredTasksOnIdleHandler() {
-            assertTrue("Page is yet to finish loading.", mObserver.isPageLoadFinished());
+            Assert.assertTrue("Page is yet to finish loading.", mObserver.isPageLoadFinished());
 
             mHelper.notifyCalled();
         }
 
         private CallbackHelper mHelper;
         private PageLoadFinishedTabObserver mObserver;
     }
 
+    @Rule
+    public final WebappActivityTestRule mActivityTestRule = new WebappActivityTestRule();
+
+    @Test
     @SmallTest
     @Feature({"Webapps"})
     public void testPageIsLoadedOnDeferredStartup() throws Exception {
         PageLoadFinishedTabObserver tabObserver = new PageLoadFinishedTabObserver();
         TabModelSelectorBase
                 .setObserverForTests(new NewTabCreatedTabModelSelectorObserver(tabObserver));
         CallbackHelper helper = new CallbackHelper();
         PageIsLoadedDeferredStartupHandler handler = new PageIsLoadedDeferredStartupHandler(
                 tabObserver, helper);
         DeferredStartupHandler.setInstanceForTests(handler);
-        startWebappActivity();
+        mActivityTestRule.startWebappActivity();
         helper.waitForCallback(0);
     }
 }