AppRTCDemo(android): remove vestigial mentions of PowerManager

R=henrike@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2402004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4995 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/examples/android/src/org/appspot/apprtc/AppRTCDemoActivity.java

@@ -34,7 +34,6 @@ import android.content.Intent;
 import android.graphics.Point;
 import android.media.AudioManager;
 import android.os.Bundle;
-import android.os.PowerManager;
 import android.util.Log;
 import android.view.WindowManager;
 import android.webkit.JavascriptInterface;
@@ -88,7 +87,6 @@ public class AppRTCDemoActivity extends Activity
   // Synchronize on quit[0] to avoid teardown-related crashes.
   private final Boolean[] quit = new Boolean[] { false };
   private MediaConstraints sdpMediaConstraints;
-  private PowerManager.WakeLock wakeLock;
 
   @Override
   public void onCreate(Bundle savedInstanceState) {
@@ -547,7 +545,6 @@ public class AppRTCDemoActivity extends Activity
         factory.dispose();
         factory = null;
       }
-      wakeLock.release();
       finish();
     }
   }