Remove duplicate using statement.

third_party/WebKit/Source/modules/indexeddb/IDBKeyPath.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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 12 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "modules/indexeddb/IDBKeyPath.h"
 
 #include "wtf/ASCIICType.h"
 #include "wtf/dtoa.h"
 #include "wtf/text/CharacterNames.h"
 #include "wtf/text/Unicode.h"
 
-using namespace WTF::Unicode;
-
 namespace blink {
 
 namespace {
 
 using namespace WTF::Unicode;
 
 // The following correspond to grammar in ECMA-262.
 const uint32_t unicodeLetter = Letter_Uppercase | Letter_Lowercase |
                                Letter_Titlecase | Letter_Modifier |
                                Letter_Other | Number_Letter;
@@ skipping 149 matching lines @@
     case StringType:
       return m_string == other.m_string;
     case ArrayType:
       return m_array == other.m_array;
   }
   ASSERT_NOT_REACHED();
   return false;
 }
 
 }  // namespace blink