Factor out GamepadCommon base class from Gamepad and WebKitGamepad

Source/modules/gamepad/WebKitGamepad.cpp

Index: Source/modules/gamepad/WebKitGamepad.cpp
diff --git a/Source/modules/gamepad/WebKitGamepad.cpp b/Source/modules/gamepad/WebKitGamepad.cpp
index 5a3fce54e2d5c83cb173ecc6c23bee0a3eee81c5..9f275cdfe1ff183128e67e82a07b9f097b54519a 100644
--- a/Source/modules/gamepad/WebKitGamepad.cpp
+++ b/Source/modules/gamepad/WebKitGamepad.cpp
@@ -7,20 +7,6 @@
 
 namespace WebCore {
 
-WebKitGamepad::WebKitGamepad()
-    : m_index(0)
-    , m_timestamp(0)
-{
-    ScriptWrappable::init(this);
-}
-
-void WebKitGamepad::setAxes(unsigned count, const float* data)
-{
-    m_axes.resize(count);
-    if (count)
-        std::copy(data, data + count, m_axes.begin());
-}
-
 void WebKitGamepad::setButtons(unsigned count, const blink::WebGamepadButton* data)
 {
     m_buttons.resize(count);
@@ -28,12 +14,4 @@ void WebKitGamepad::setButtons(unsigned count, const blink::WebGamepadButton* da
         m_buttons[i] = data[i].value;
 }
 
-void WebKitGamepad::trace(Visitor* visitor)
-{
-}
-
-WebKitGamepad::~WebKitGamepad()
-{
-}
-
 } // namespace WebCore