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

Source/web/tests/TextFinderTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "web/TextFinder.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Document.h"
 #include "core/dom/NodeList.h"
 #include "core/dom/Range.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLElement.h"
 #include "public/platform/Platform.h"
 #include "public/web/WebDocument.h"
 #include "web/FindInPageCoordinates.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/tests/FrameTestHelpers.h"
 #include "wtf/OwnPtr.h"
 #include <gtest/gtest.h>
 
 using namespace blink;
-using namespace blink;
 
 namespace {
 
 class TextFinderTest : public ::testing::Test {
 protected:
     virtual void SetUp() OVERRIDE;
 
     Document& document() const;
     TextFinder& textFinder() const;
 
@@ skipping 435 matching lines @@
     // There will be only one iteration before timeout, because increment
     // of the TimeProxyPlatform timer is greater than timeout threshold.
     textFinder().scopeStringMatches(identifier, searchPattern, findOptions, true);
     while (textFinder().scopingInProgress())
         FrameTestHelpers::runPendingTasks();
 
     EXPECT_EQ(4, textFinder().totalMatchCount());
 }
 
 } // namespace