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

Source/web/tests/PageSerializerTest.cpp

 /*
  * Copyright (c) 2013, Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 31 matching lines @@
 #include "public/platform/WebURLResponse.h"
 #include "public/platform/WebUnitTestSupport.h"
 #include "public/web/WebSettings.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebViewImpl.h"
 #include "web/tests/FrameTestHelpers.h"
 #include "wtf/Vector.h"
 #include <gtest/gtest.h>
 
 using namespace blink;
-using namespace blink;
 using blink::URLTestHelpers::toKURL;
 using blink::URLTestHelpers::registerMockedURLLoad;
 
 namespace {
 
 class PageSerializerTest : public testing::Test {
 public:
     PageSerializerTest()
         : m_folder(WebString::fromUTF8("pageserializer/"))
         , m_baseUrl(toKURL("http://www.test.com"))
@@ skipping 137 matching lines @@
 
     registerURL("font.html", "text/html");
     registerURL("font.ttf", "application/octet-stream");
 
     serialize("font.html");
 
     EXPECT_TRUE(isSerialized("font.ttf", "application/octet-stream"));
 }
 
 }