Move string tokenizer to base/strings.

net/base/net_util.cc

Index: net/base/net_util.cc
diff --git a/net/base/net_util.cc b/net/base/net_util.cc
index 05e59e3303882deb76c445fe31b0d7d0f33a4cd6..019fddfbba8488d4b3134959b26b7ffa498f4eb4 100644
--- a/net/base/net_util.cc
+++ b/net/base/net_util.cc
@@ -42,9 +42,9 @@
 #include "base/string_number_conversions.h"
 #include "base/string_piece.h"
 #include "base/string_split.h"
-#include "base/string_tokenizer.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
+#include "base/strings/string_tokenizer.h"
 #include "base/synchronization/lock.h"
 #include "base/sys_string_conversions.h"
 #include "base/sys_byteorder.h"
@@ -397,7 +397,7 @@ bool IsIDNComponentSafe(const char16* str,
   // the remainder.
   component_characters.removeAll(common_characters);
 
-  StringTokenizer t(languages, ",");
+  base::StringTokenizer t(languages, ",");
   while (t.GetNext()) {
     if (IsComponentCoveredByLang(component_characters, t.token()))
       return true;