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

Source/web/tests/WebImageTest.cpp

 /*
  * Copyright (C) 2012 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 21 matching lines @@
 #include "public/platform/WebImage.h"
 
 #include "platform/SharedBuffer.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebData.h"
 #include "public/platform/WebSize.h"
 #include "public/platform/WebUnitTestSupport.h"
 #include <gtest/gtest.h>
 
 using namespace blink;
-using namespace blink;
 
 namespace {
 
 static PassRefPtr<SharedBuffer> readFile(const char* fileName)
 {
     String filePath = Platform::current()->unitTestSupport()->webKitRootDir();
     filePath.append("/Source/web/tests/data/");
     filePath.append(fileName);
 
     return Platform::current()->unitTestSupport()->readFromFile(filePath);
@@ skipping 39 matching lines @@
     const char badImage[] = "hello world";
     WebVector<WebImage> images = WebImage::framesFromData(WebData(badImage));
     ASSERT_EQ(0u, images.size());
 
     WebImage image = WebImage::fromData(WebData(badImage), WebSize());
     EXPECT_TRUE(image.getSkBitmap().empty());
     EXPECT_TRUE(image.getSkBitmap().isNull());
 }
 
 } // namespace