Bug 1624675 - Remove obsolete code in AndroidGamepadManager. r=snorp

Differential Revision: https://phabricator.services.mozilla.com/D68437

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview/src/main/java/org/mozilla/gecko/AndroidGamepadManager.java

@@ -8,7 +8,6 @@ package org.mozilla.gecko;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Timer;
-import java.util.TimerTask;
 
 import org.mozilla.gecko.annotation.WrapForJNI;
 import org.mozilla.gecko.util.GamepadUtils;
@@ -16,7 +15,6 @@ import org.mozilla.gecko.util.ThreadUtils;
 
 import android.content.Context;
 import android.hardware.input.InputManager;
-import android.os.Build;
 import android.util.SparseArray;
 import android.view.InputDevice;
 import android.view.KeyEvent;
@@ -363,21 +361,6 @@ public class AndroidGamepadManager {
     }
 
     private static void addDeviceListener(final Context context) {
-        if (Build.VERSION.SDK_INT < 16) {
-            // Poll known gamepads to see if they've disappeared.
-            sPollTimer = new Timer();
-            sPollTimer.scheduleAtFixedRate(new TimerTask() {
-                    @Override
-                    public void run() {
-                        for (int i = 0; i < sGamepads.size(); ++i) {
-                            final int deviceId = sGamepads.keyAt(i);
-                            if (InputDevice.getDevice(deviceId) == null) {
-                                removeGamepad(deviceId);
-                            }
-                        }
-                    }
-                }, POLL_TIMER_PERIOD, POLL_TIMER_PERIOD);
-        } else {
         sListener = new InputManager.InputDeviceListener() {
             @Override
             public void onInputDeviceAdded(final int deviceId) {
@@ -411,19 +394,11 @@ public class AndroidGamepadManager {
                 context.getSystemService(Context.INPUT_SERVICE);
         im.registerInputDeviceListener(sListener, ThreadUtils.getUiHandler());
     }
-    }
 
     private static void removeDeviceListener(final Context context) {
-        if (Build.VERSION.SDK_INT < 16) {
-            if (sPollTimer != null) {
-                sPollTimer.cancel();
-                sPollTimer = null;
-            }
-        } else {
         final InputManager im = (InputManager)
                 context.getSystemService(Context.INPUT_SERVICE);
         im.unregisterInputDeviceListener(sListener);
         sListener = null;
     }
 }
-}