Use a direct include of strings headers in webkit/, part 2.

webkit/renderer/cpp_variant_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <vector>
 
 #include "base/compiler_specific.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
 #include "webkit/renderer/cpp_variant.h"
 
 using WebKit::WebBindings;
 using webkit_glue::CppVariant;
 
 // Creates a std::string from an NPVariant of string type.  If the NPVariant
 // is not a string, empties the std::string.
 void MakeStdString(const NPVariant& np, std::string* std_string) {
@@ skipping 466 matching lines @@
   EXPECT_TRUE(cpp_vector[1].isBool());
   EXPECT_EQ(true, cpp_vector[1].ToBoolean());
 
   EXPECT_TRUE(cpp_vector[2].isNull());
 
   EXPECT_TRUE(cpp_vector[3].isString());
   CheckString("string", cpp_vector[3]);
 
   WebBindings::releaseObject(obj);
 }