Removing duplicate 'using namespace blink;' in platform and web

Source/web/PopupMenuTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 52 matching lines @@
 #include "web/PopupContainer.h"
 #include "web/PopupListBox.h"
 #include "web/PopupMenuChromium.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebPopupMenuImpl.h"
 #include "web/WebViewImpl.h"
 #include "web/tests/FrameTestHelpers.h"
 #include <gtest/gtest.h>
 
 using namespace blink;
-using namespace blink;
 using blink::URLTestHelpers::toKURL;
 
 namespace {
 
 class TestPopupMenuClient : public PopupMenuClient {
 public:
     // Item at index 0 is selected by default.
     TestPopupMenuClient() : m_selectIndex(0), m_node(0), m_listSize(10) { }
     virtual ~TestPopupMenuClient() { }
     virtual void valueChanged(unsigned listIndex, bool fireEvents = true)
@@ skipping 521 matching lines @@
     ASSERT(menuList);
     menuList->showPopup();
     ASSERT(popupOpen());
     PopupListBox* listBox = webView()->selectPopup()->listBox();
     int ltrWidth = listBox->getRowBaseWidth(0);
     int rtlWidth = listBox->getRowBaseWidth(1);
     EXPECT_LT(rtlWidth, ltrWidth);
 }
 
 } // namespace