Replace deprecated Android java test annotations

chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappModeTest.java

 // Copyright 2015 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.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.test.suitebuilder.annotation.MediumTest;
+import android.support.test.filters.MediumTest;
 import android.view.View;
 
 import org.chromium.base.ApplicationStatus;
 import org.chromium.base.ContextUtils;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.RetryOnFailure;
 import org.chromium.base.test.util.UrlUtils;
 import org.chromium.blink_public.platform.WebDisplayMode;
 import org.chromium.chrome.browser.ChromeActivity;
@@ skipping 308 matching lines @@
 
         WebappActivity webappActivity = (WebappActivity) lastActivity;
         if (webappActivity.getActivityTab() == null) return false;
 
         View rootView = webappActivity.findViewById(android.R.id.content);
         if (!rootView.hasWindowFocus()) return false;
 
         return true;
     }
 }