Implement MouseEvent.getModifierState

Source/core/events/KeyboardEvent.cpp

Index: Source/core/events/KeyboardEvent.cpp
diff --git a/Source/core/events/KeyboardEvent.cpp b/Source/core/events/KeyboardEvent.cpp
index 54e373d63e29d822fea49978759ac7cbd8d23188..fc5e78259aafc36931cad0b1a6ef7eaae96e06b5 100644
--- a/Source/core/events/KeyboardEvent.cpp
+++ b/Source/core/events/KeyboardEvent.cpp
@@ -154,21 +154,6 @@ void KeyboardEvent::initKeyboardEvent(ScriptState* scriptState, const AtomicStri
     m_metaKey = metaKey;
 }
 
-bool KeyboardEvent::getModifierState(const String& keyIdentifier) const
-{
-    // FIXME: The following keyIdentifiers are not supported yet (crbug.com/265458):
-    // "AltGraph", "CapsLock", "Fn", "NumLock", "ScrollLock", "SymbolLock", "OS".
-    if (keyIdentifier == "Control")
-        return ctrlKey();
-    if (keyIdentifier == "Shift")
-        return shiftKey();
-    if (keyIdentifier == "Alt")
-        return altKey();
-    if (keyIdentifier == "Meta")
-        return metaKey();
-    return false;
-}
-
 int KeyboardEvent::keyCode() const
 {
     // IE: virtual key code for keyup/keydown, character code for keypress