Remove some unnecessary use of hidden APIs

Change-Id: Ie72947017550d759994e34d7db8087d1f9e6d63a
diff --git a/src/com/android/browser/Tab.java b/src/com/android/browser/Tab.java
index 5e02f2d..cb70e01 100644
--- a/src/com/android/browser/Tab.java
+++ b/src/com/android/browser/Tab.java
@@ -845,7 +845,7 @@
             if (!mInForeground || mActivity.mActivityInPause) {
                 return;
             }
-            if (event.isDown()) {
+            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                 mActivity.onKeyDown(event.getKeyCode(), event);
             } else {
                 mActivity.onKeyUp(event.getKeyCode(), event);