Use a direct include of strings headers in rlz/, sandbox/, skia/, sql/, sync/.

sql/statement.h

 // 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.
 
 #ifndef SQL_STATEMENT_H_
 #define SQL_STATEMENT_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "sql/connection.h"
 #include "sql/sql_export.h"
 
 namespace sql {
 
 // Possible return values from ColumnType in a statement. These should match
 // the values in sqlite3.h.
 enum ColType {
   COLUMN_TYPE_INTEGER = 1,
   COLUMN_TYPE_FLOAT = 2,
@@ skipping 156 matching lines @@
 
   // See Succeeded() for what this holds.
   bool succeeded_;
 
   DISALLOW_COPY_AND_ASSIGN(Statement);
 };
 
 }  // namespace sql
 
 #endif  // SQL_STATEMENT_H_