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

Source/web/tests/PaintAggregatorTest.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 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "web/painting/PaintAggregator.h"
 
 #include <gtest/gtest.h>
 
 using namespace blink;
-using namespace blink;
 
 namespace {
 
 TEST(PaintAggregator, InitialState)
 {
     PaintAggregator greg;
     EXPECT_FALSE(greg.hasPendingUpdate());
 }
 
 TEST(PaintAggregator, SingleInvalidation)
@@ skipping 436 matching lines @@
     greg.popPendingUpdate(&update);
 
     EXPECT_FALSE(update.scrollRect.isEmpty());
     EXPECT_TRUE(update.paintRects.isEmpty());
 
     EXPECT_EQ(scrollRect, update.scrollRect);
     EXPECT_EQ(expectedScrollDamage, update.calculateScrollDamage());
 }
 
 } // namespace