Fix unit test style in Source/platform/, part 2.

Source/platform/text/SegmentedStringTest.cpp

 /*
  * Copyright (C) 2014 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 15 matching lines @@
  * 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 "config.h"
 #include "platform/text/SegmentedString.h"
 
 #include <gtest/gtest.h>
 
-using blink::SegmentedString;
-
-namespace {
+namespace blink {
 
 TEST(SegmentedStringTest, CurrentChar)
 {
     SegmentedString original(String("cde"));
     {
         SegmentedString copied(original);
         SegmentedString assigned;
         assigned = original;
         EXPECT_EQ("cde", original.toString());
         EXPECT_EQ('c', original.currentChar());
@@ skipping 27 matching lines @@
         SegmentedString copied(original);
         SegmentedString assigned;
         assigned = original;
         EXPECT_EQ("bcde", original.toString());
         EXPECT_EQ('b', original.currentChar());
         EXPECT_EQ('b', copied.currentChar());
         EXPECT_EQ('b', assigned.currentChar());
     }
 }
 
-} // namespace
+} // namespace blink