Sync Navigator.getGamepads() with the spec

LayoutTests/gamepad/gamepad-polling-access-expected.txt

Index: LayoutTests/gamepad/gamepad-polling-access-expected.txt
diff --git a/LayoutTests/gamepad/gamepad-polling-access-expected.txt b/LayoutTests/gamepad/gamepad-polling-access-expected.txt
index 15d54ce40ab1efb55871ea2ff48a8fb8ea77ffb4..9142de177201ab9fbf2024cde18e529d2ae8dcc5 100644
--- a/LayoutTests/gamepad/gamepad-polling-access-expected.txt
+++ b/LayoutTests/gamepad/gamepad-polling-access-expected.txt
@@ -1,15 +1,28 @@
-PASS navigator.getGamepads().length is 4
-PASS navigator.getGamepads().item(0) is null
-PASS navigator.getGamepads().item(1) is null
-PASS navigator.getGamepads().item(2) is null
-PASS navigator.getGamepads().item(3) is null
-PASS navigator.getGamepads()[0] is undefined.
-PASS navigator.getGamepads()[1] is undefined.
-PASS navigator.getGamepads()[2] is undefined.
-PASS navigator.getGamepads()[3] is undefined.
-PASS navigator.getGamepads()[0] is non-null.
-PASS navigator.getGamepads().item(0) is null
-PASS navigator.getGamepads()[0] is undefined.
+PASS navigator.getGamepads() is an instance of Array
+PASS navigator.getGamepads().length is 0
+PASS navigator.getGamepads().hasOwnProperty(0) is false
+PASS navigator.getGamepads().hasOwnProperty(1) is false
+PASS navigator.getGamepads().length is 1
+PASS navigator.getGamepads().hasOwnProperty(0) is true
+PASS navigator.getGamepads()[0] is an instance of Gamepad
+PASS navigator.getGamepads()[0].index is 0
+PASS navigator.getGamepads().hasOwnProperty(1) is false
+PASS navigator.getGamepads().length is 2
+PASS navigator.getGamepads().hasOwnProperty(0) is true
+PASS navigator.getGamepads()[0] is an instance of Gamepad
+PASS navigator.getGamepads()[0].index is 0
+PASS navigator.getGamepads().hasOwnProperty(1) is true
+PASS navigator.getGamepads()[1] is an instance of Gamepad
+PASS navigator.getGamepads()[1].index is 1
+PASS navigator.getGamepads().length is 2
+PASS navigator.getGamepads().hasOwnProperty(0) is true
+PASS navigator.getGamepads()[0] is null
+PASS navigator.getGamepads().hasOwnProperty(1) is true
+PASS navigator.getGamepads()[1] is an instance of Gamepad
+PASS navigator.getGamepads()[1].index is 1
+PASS navigator.getGamepads().length is 0
+PASS navigator.getGamepads().hasOwnProperty(0) is false
+PASS navigator.getGamepads().hasOwnProperty(1) is false
 PASS navigator.getGamepads()[0].id is 'MockStick 3000'
 PASS navigator.getGamepads()[0].buttons.length is 2
 PASS navigator.getGamepads()[0].axes.length is 2