Make calls to AtomicString(const String&) explicit in page/

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 31400d6cb59d30dc80320912714f506afb879024..8bf1fc90ae38870c911025a96f7edb95ff69eb99 100755
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -3196,7 +3196,7 @@ void EventHandler::defaultKeyboardEventHandler(KeyboardEvent* event)
         else if (event->keyIdentifier() == "U+001B")
             defaultEscapeEventHandler(event);
         else {
-            FocusDirection direction = focusDirectionForKey(event->keyIdentifier());
+            FocusDirection direction = focusDirectionForKey(AtomicString(event->keyIdentifier()));
             if (direction != FocusDirectionNone)
                 defaultArrowEventHandler(direction, event);
         }