Remove unused "using" statements in WebKit/Source/platform.

third_party/WebKit/Source/platform/fonts/FontDataCache.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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (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 "platform/fonts/FontDataCache.h"
 
 #include "platform/fonts/SimpleFontData.h"
 
-using namespace WTF;
-
 namespace blink {
 
 #if !OS(ANDROID)
 const unsigned kCMaxInactiveFontData = 250;
 const unsigned kCTargetInactiveFontData = 200;
 #else
 const unsigned kCMaxInactiveFontData = 225;
 const unsigned kCTargetInactiveFontData = 200;
 #endif
 
@@ skipping 117 matching lines @@
   bool did_work = font_data_to_delete.size();
 
   font_data_to_delete.clear();
 
   is_purging = false;
 
   return did_work;
 }
 
 }  // namespace blink