Enforce SafetyMode for YouTube if prefs::kForceSafeSearch is on.

base/strings/string_util.h

 // Copyright 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.
 //
 // This file defines utility functions for working with strings.
 
 #ifndef BASE_STRINGS_STRING_UTIL_H_
 #define BASE_STRINGS_STRING_UTIL_H_
 
 #include <ctype.h>
@@ skipping 443 matching lines @@
     const std::vector<std::string>& parts, char s);
 
 // Join |parts| using |separator|.
 BASE_EXPORT std::string JoinString(
     const std::vector<std::string>& parts,
     const std::string& separator);
 BASE_EXPORT base::string16 JoinString(
     const std::vector<base::string16>& parts,
     const base::string16& separator);
 
+typedef std::vector<std::pair<std::string, std::string> > StringPairs;
+
+// Does the opposite of SplitStringIntoKeyValuePairs().
+BASE_EXPORT std::string JoinStringKeyValuePairs(const StringPairs& pairs,
+                                                char key_value_delimiter,
+                                                char key_value_pair_delimiter);
+
 // Replace $1-$2-$3..$9 in the format string with |a|-|b|-|c|..|i| respectively.
 // Additionally, any number of consecutive '$' characters is replaced by that
 // number less one. Eg $$->$, $$$->$$, etc. The offsets parameter here can be
 // NULL. This only allows you to use up to nine replacements.
 BASE_EXPORT base::string16 ReplaceStringPlaceholders(
     const base::string16& format_string,
     const std::vector<base::string16>& subst,
     std::vector<size_t>* offsets);
 
 BASE_EXPORT std::string ReplaceStringPlaceholders(
@@ skipping 40 matching lines @@
 #elif defined(WCHAR_T_IS_UTF32)
   typedef uint32 Unsigned;
 #endif
 };
 template<>
 struct ToUnsigned<short> {
   typedef unsigned short Unsigned;
 };
 
 #endif  // BASE_STRINGS_STRING_UTIL_H_