Use a direct include of strings headers in base/.

base/json/string_escape.cc

 // Copyright (c) 2006-2008 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/string_escape.h"
 
 #include <string>
 
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 
 namespace base {
 
 namespace {
 
 // Try to escape |c| as a "SingleEscapeCharacter" (\n, etc).  If successful,
 // returns true and appends the escape sequence to |dst|.  This isn't required
 // by the spec, but it's more readable by humans than the \uXXXX alternatives.
 template<typename CHAR>
 static bool JsonSingleEscapeChar(const CHAR c, std::string* dst) {
@@ skipping 75 matching lines @@
   JsonDoubleQuoteT(str, put_in_quotes, dst);
 }
 
 std::string GetDoubleQuotedJson(const string16& str) {
   std::string dst;
   JsonDoubleQuote(str, true, &dst);
   return dst;
 }
 
 }  // namespace base