[ScreenOrientation] Merge mojo interface ScreenOrientationListener into ScreenOrientation

device/screen_orientation/public/interfaces/screen_orientation.mojom

 // 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.
 
 module device.mojom;
 
 import "device/screen_orientation/public/interfaces/screen_orientation_lock_types.mojom";
 
+// {Start,Stop}AccurateListen are expected to be used when the platform requires
+// heavy work in order to accurately know the screen orientation.
+// For example, on Android, this is required for Jelly Bean, where there is no
+// API to be notified of a screen orientation change of 180 degrees.
 interface ScreenOrientation {
   LockOrientation(ScreenOrientationLockType orientation) =>
     (ScreenOrientationLockResult result);
   UnlockOrientation();
-};
 
-// ScreenOrientationListener is expected to be used when the platform requires
-// heavy work in order to accurately know the screen orientation.
-// For example, on Android, this is required for Jelly Bean, where there is no
-// API to be notified of a screen orientation change of 180 degrees.
-interface ScreenOrientationListener {
-  // The renderer process is now using the Screen Orientation API and informs
+  // The renderer frame is now using the Screen Orientation API and informs
   // the browser process that it should start accurately listening to the screen
   // orientation if it wasn't already.
-  Start();
-  
-  // The renderer process is no longer using the Screen Orientation API and
+  StartAccurateListen();
+  // The renderer frame is no longer using the Screen Orientation API and
   // informs the browser process that it can stop accurately listening to the
-  // screen orientation if no other process cares about it.
-  Stop();
+  // screen orientation if no other frame cares about it.
+  StopAccurateListen();
 };