Android: Simplify isTablet and InterfaceRegistrars

content/public/android/javatests/src/org/chromium/content/browser/VideoRotateToFullscreenTest.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.content.browser;
 
 import android.content.pm.ActivityInfo;
 import android.support.test.filters.MediumTest;
 
 import org.junit.After;
@@ skipping 75 matching lines @@
                         ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
             }
         });
     }
 
     @Test
     @MediumTest
     @Feature({"VideoRotateToFullscreen"})
     public void testPortraitToLandscapeAndBack() throws Exception {
         // TODO(johnme): Use RESTRICTION_TYPE_PHONE once crbug.com/673917 moves it out of chrome/.
-        if (DeviceFormFactor.isTablet(mRule.getActivity())) {
+        if (DeviceFormFactor.isTablet()) {
             return;
         }
 
         // Start off in portrait screen orientation.
         mRule.getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
         waitForScreenOrientation("\"portrait\"");
 
         // Start playback.
         Assert.assertTrue(DOMUtils.isMediaPaused(mRule.getWebContents(), VIDEO_ID));
         DOMUtils.playMedia(mRule.getWebContents(), VIDEO_ID);
         DOMUtils.waitForMediaPlay(mRule.getWebContents(), VIDEO_ID);
 
         // Rotate screen from portrait to landscape.
         mRule.getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
         waitForScreenOrientation("\"landscape\"");
 
         // Should enter fullscreen.
         waitForContentsFullscreenState(true);
 
         // Rotate screen from landscape to portrait(?).
         mRule.getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
         waitForScreenOrientation("\"portrait\"");
 
         // Should exit fullscreen.
         waitForContentsFullscreenState(false);
     }
 }