add close tab shortcut

    Bug: 3270434
    ctrl-w to close tab

Change-Id: Ic96b25bc27dd952080681acf53ce43cfcc9faf13
diff --git a/src/com/android/browser/Controller.java b/src/com/android/browser/Controller.java
index 80cc7ca..36c519a 100644
--- a/src/com/android/browser/Controller.java
+++ b/src/com/android/browser/Controller.java
@@ -2587,7 +2587,12 @@
                 break;
 //          case KeyEvent.KEYCODE_U:    // in Chrome: opens source of page
 //          case KeyEvent.KEYCODE_V:    // text view intercepts to paste
-//          case KeyEvent.KEYCODE_W:    // menu
+            case KeyEvent.KEYCODE_W:    // in Chrome: close tab
+                if (ctrl) {
+                    closeCurrentTab();
+                    return true;
+                }
+                break;
 //          case KeyEvent.KEYCODE_X:    // text view intercepts to cut
 //          case KeyEvent.KEYCODE_Y:    // unused
 //          case KeyEvent.KEYCODE_Z:    // unused