Add missing closing namespace comments to wtf.

third_party/WebKit/Source/wtf/text/StringBuilderTest.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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.
@@ skipping 39 matching lines @@
         EXPECT_EQ(expected, String(builder.characters16(), builder.length()));
 }
 
 void expectEmpty(const StringBuilder& builder)
 {
     EXPECT_EQ(0U, builder.length());
     EXPECT_TRUE(builder.isEmpty());
     EXPECT_EQ(0, builder.characters8());
 }
 
-}
+} // namespace
 
 TEST(StringBuilderTest, DefaultConstructor)
 {
     StringBuilder builder;
     expectEmpty(builder);
 }
 
 TEST(StringBuilderTest, Append)
 {
     StringBuilder builder;
@@ skipping 246 matching lines @@
     StringBuilder reference;
     reference.append(replacementCharacter); // Make it UTF-16.
     reference.append(String::number(someNumber));
     StringBuilder test;
     test.append(replacementCharacter);
     test.appendNumber(someNumber);
     EXPECT_EQ(reference, test);
 }
 
 } // namespace WTF