Use a direct include of utf_string_conversions.h in chrome/browser/, part 3.

chrome/browser/spellchecker/misspelling_unittest.cc

 // Copyright (c) 2013 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 "base/json/json_reader.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/spellchecker/misspelling.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(MisspellingTest, SerializeTest) {
   Misspelling misspelling;
   misspelling.context = ASCIIToUTF16("How doe sit know");
   misspelling.location = 4;
   misspelling.length = 7;
   misspelling.timestamp = base::Time::FromJsTime(42);
   misspelling.hash = 9001;
   misspelling.suggestions.push_back(ASCIIToUTF16("does it"));
 
   scoped_ptr<base::Value> expected(base::JSONReader::Read(
       "{\"originalText\": \"How doe sit know\","
       "\"misspelledStart\": 4,"
       "\"misspelledLength\": 7,"
       "\"timestamp\": \"42\","
       "\"suggestionId\":\"9001\","
       "\"suggestions\": [\"does it\"],"
       "\"userActions\": [{\"actionType\": \"PENDING\"}]}"));
 
   scoped_ptr<base::DictionaryValue> serialized(misspelling.Serialize());
   EXPECT_TRUE(serialized->Equals(expected.get()));
 }