Skip a few "using namespace" that we don't really need.

third_party/WebKit/Source/core/html/HTMLSelectElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
@@ skipping 56 matching lines @@
 #include "core/layout/LayoutMenuList.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/page/AutoscrollController.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
 #include "core/page/SpatialNavigation.h"
 #include "platform/PopupMenu.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 #include "platform/text/PlatformLocale.h"
 
-using namespace WTF::Unicode;
-
 namespace blink {
 
 using namespace HTMLNames;
 
 // Upper limit of m_listItems. According to the HTML standard, options larger
 // than this limit doesn't work well because |selectedIndex| IDL attribute is
 // signed.
 static const unsigned maxListItems = INT_MAX;
 
 HTMLSelectElement::HTMLSelectElement(Document& document)
@@ skipping 1582 matching lines @@
     menuListDefaultEventHandler(event);
   else
     listBoxDefaultEventHandler(event);
   if (event->defaultHandled())
     return;
 
   if (event->type() == EventTypeNames::keypress && event->isKeyboardEvent()) {
     KeyboardEvent* keyboardEvent = toKeyboardEvent(event);
     if (!keyboardEvent->ctrlKey() && !keyboardEvent->altKey() &&
         !keyboardEvent->metaKey() &&
-        isPrintableChar(keyboardEvent->charCode())) {
+        WTF::Unicode::isPrintableChar(keyboardEvent->charCode())) {
       typeAheadFind(keyboardEvent);
       event->setDefaultHandled();
       return;
     }
   }
   HTMLFormControlElementWithState::defaultEventHandler(event);
 }
 
 HTMLOptionElement* HTMLSelectElement::lastSelectedOption() const {
   const ListItems& items = listItems();
@@ skipping 349 matching lines @@
   m_popupUpdater = nullptr;
 }
 
 void HTMLSelectElement::didMutateSubtree() {
   DCHECK(popupIsVisible());
   DCHECK(m_popup);
   m_popup->updateFromElement(PopupMenu::ByDOMChange);
 }
 
 }  // namespace blink