Factor out GamepadCommon base class from Gamepad and WebKitGamepad

Source/modules/gamepad/Gamepad.cpp

Index: Source/modules/gamepad/Gamepad.cpp
diff --git a/Source/modules/gamepad/Gamepad.cpp b/Source/modules/gamepad/Gamepad.cpp
index 499e97bf49bc618b51fdb1a908a2d8f4385be5f9..f2950ec55660657c4635d56fa0c0f64ee3058212 100644
--- a/Source/modules/gamepad/Gamepad.cpp
+++ b/Source/modules/gamepad/Gamepad.cpp
@@ -29,17 +29,12 @@
 namespace WebCore {
 
 Gamepad::Gamepad()
-    : m_index(0)
-    , m_timestamp(0)
 {
     ScriptWrappable::init(this);
 }
 
-void Gamepad::setAxes(unsigned count, const float* data)
+Gamepad::~Gamepad()
 {
-    m_axes.resize(count);
-    if (count)
-        std::copy(data, data + count, m_axes.begin());
 }
 
 void Gamepad::setButtons(unsigned count, const blink::WebGamepadButton* data)
@@ -60,8 +55,4 @@ void Gamepad::trace(Visitor* visitor)
     visitor->trace(m_buttons);
 }
 
-Gamepad::~Gamepad()
-{
-}
-
 } // namespace WebCore