Fix ODR violation that can break WTF::String pretty printing in tests.

Source/platform/weborigin/DatabaseIdentifierTest.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 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/weborigin/DatabaseIdentifier.h"
 
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/SecurityOrigin.h"
-#include "wtf/testing/WTFTestHelpers.h"
 #include <gtest/gtest.h>
 
 namespace blink {
 
 TEST(DatabaseIdentifierTest, CreateIdentifierFromSecurityOrigin)
 {
     struct OriginTestCase {
         String protocol;
         String host;
         int port;
@@ skipping 200 matching lines @@
     };
 
     for (size_t i = 0; i < arraysize(bogusIdentifiers); ++i) {
         RefPtr<SecurityOrigin> origin = createSecurityOriginFromDatabaseIdentifier(bogusIdentifiers[i]);
         EXPECT_EQ("null", origin->toString()) << "test case " << i;
         EXPECT_EQ(true, origin->isUnique()) << "test case " << i;
     }
 }
 
 } // namespace blink