Define DOM_KEY_LOCATION_* constants on KeyboardEvent

Source/web/WebInputEventConversion.cpp

Index: Source/web/WebInputEventConversion.cpp
diff --git a/Source/web/WebInputEventConversion.cpp b/Source/web/WebInputEventConversion.cpp
index ac156b99b7f86f47d4692fa700a9fb0ca07c2abd..c2735f78667df09eddc47fafa6d0d69b09756252 100644
--- a/Source/web/WebInputEventConversion.cpp
+++ b/Source/web/WebInputEventConversion.cpp
@@ -602,11 +602,11 @@ WebKeyboardEventBuilder::WebKeyboardEventBuilder(const KeyboardEvent& event)
         return; // Skip all other keyboard events.
 
     modifiers = getWebInputModifiers(event);
-    if (event.location() == KeyboardEvent::DOMKeyLocationNumpad)
+    if (event.location() == KeyboardEvent::DOM_KEY_LOCATION_NUMPAD)
         modifiers |= WebInputEvent::IsKeyPad;
-    else if (event.location() == KeyboardEvent::DOMKeyLocationLeft)
+    else if (event.location() == KeyboardEvent::DOM_KEY_LOCATION_LEFT)
         modifiers |= WebInputEvent::IsLeft;
-    else if (event.location() == KeyboardEvent::DOMKeyLocationRight)
+    else if (event.location() == KeyboardEvent::DOM_KEY_LOCATION_RIGHT)
         modifiers |= WebInputEvent::IsRight;
 
     timeStampSeconds = event.timeStamp() / millisPerSecond;