Added non-prefixed navigator.getGamepads() with updated API

Source/modules/gamepad/GamepadList.cpp

Index: Source/modules/gamepad/GamepadList.cpp
diff --git a/Source/modules/gamepad/GamepadList.cpp b/Source/modules/gamepad/GamepadList.cpp
index 86a57d2f1c22b6bcd527cf9fac1279f757a0a01d..cc29a73dbbddb90c0752ee0f7d3cb8edc4f7e3c5 100644
--- a/Source/modules/gamepad/GamepadList.cpp
+++ b/Source/modules/gamepad/GamepadList.cpp
@@ -34,14 +34,14 @@ GamepadList::~GamepadList()
 
 void GamepadList::set(unsigned index, PassRefPtrWillBeRawPtr<Gamepad> gamepad)
 {
-    if (index >= kMaximumGamepads)
+    if (index >= blink::WebGamepads::itemsLengthCap)
         return;
     m_items[index] = gamepad;
 }
 
 unsigned GamepadList::length() const
 {
-    return kMaximumGamepads;
+    return blink::WebGamepads::itemsLengthCap;
 }
 
 Gamepad* GamepadList::item(unsigned index)
@@ -51,7 +51,7 @@ Gamepad* GamepadList::item(unsigned index)
 
 void GamepadList::trace(Visitor* visitor)
 {
-    for (unsigned index = 0; index < kMaximumGamepads; index++) {
+    for (unsigned index = 0; index < blink::WebGamepads::itemsLengthCap; index++) {
         visitor->trace(m_items[index]);
     }
 }