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

Source/web/tests/WebScopedWindowFocusAllowedIndicatorTest.cpp

 /*
  * Copyright (C) 2013 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 18 matching lines @@
  */
 
 #include "config.h"
 #include "public/web/WebScopedWindowFocusAllowedIndicator.h"
 
 #include "core/page/WindowFocusAllowedIndicator.h"
 #include <gtest/gtest.h>
 
 
 using namespace blink;
-using namespace blink;
 
 namespace {
 
 TEST(WebScopedWindowFocusAllowedIndicatorTest, Basic)
 {
     EXPECT_FALSE(WindowFocusAllowedIndicator::windowFocusAllowed());
     {
         WebScopedWindowFocusAllowedIndicator indicator1;
         EXPECT_TRUE(WindowFocusAllowedIndicator::windowFocusAllowed());
         {
             WebScopedWindowFocusAllowedIndicator indicator2;
             EXPECT_TRUE(WindowFocusAllowedIndicator::windowFocusAllowed());
         }
         EXPECT_TRUE(WindowFocusAllowedIndicator::windowFocusAllowed());
     }
     EXPECT_FALSE(WindowFocusAllowedIndicator::windowFocusAllowed());
 }
 
 }