Move string tokenizer to base/strings.

net/http/http_security_headers.cc

Index: net/http/http_security_headers.cc
diff --git a/net/http/http_security_headers.cc b/net/http/http_security_headers.cc
index 80189273090257169462ad6e578582882717d8d4..7671c8e9740a1ec4f15241b9dcddca4ac45f8834 100644
--- a/net/http/http_security_headers.cc
+++ b/net/http/http_security_headers.cc
@@ -5,8 +5,8 @@
 #include "base/base64.h"
 #include "base/basictypes.h"
 #include "base/string_number_conversions.h"
-#include "base/string_tokenizer.h"
 #include "base/string_util.h"
+#include "base/strings/string_tokenizer.h"
 #include "net/http/http_security_headers.h"
 #include "net/http/http_util.h"
 
@@ -185,8 +185,8 @@ bool ParseHSTSHeader(const base::Time& now, const std::string& value,
     DIRECTIVE_END
   } state = START;
 
-  StringTokenizer tokenizer(value, " \t=;");
-  tokenizer.set_options(StringTokenizer::RETURN_DELIMS);
+  base::StringTokenizer tokenizer(value, " \t=;");
+  tokenizer.set_options(base::StringTokenizer::RETURN_DELIMS);
   tokenizer.set_quote_chars("\"");
   std::string unquoted;
   while (tokenizer.GetNext()) {