autofill: switch autofill_regexes to RE2 library

components/autofill/core/browser/phone_field.cc

Index: components/autofill/core/browser/phone_field.cc
diff --git a/components/autofill/core/browser/phone_field.cc b/components/autofill/core/browser/phone_field.cc
index 77a8d9f08aa6bf22eec63f325d6101b9478298eb..74f93a4f3e561c3438ae801177b93df817d39dd5 100644
--- a/components/autofill/core/browser/phone_field.cc
+++ b/components/autofill/core/browser/phone_field.cc
@@ -8,7 +8,6 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autofill_field.h"
 #include "components/autofill/core/browser/autofill_regex_constants.h"
 #include "components/autofill/core/browser/autofill_scanner.h"
@@ -276,10 +275,8 @@ std::string PhoneField::GetRegExp(RegexType regex_id) {
 bool PhoneField::ParsePhoneField(AutofillScanner* scanner,
                                  const std::string& regex,
                                  AutofillField** field) {
-  return ParseFieldSpecifics(scanner,
-                             base::UTF8ToUTF16(regex),
-                             MATCH_DEFAULT | MATCH_TELEPHONE | MATCH_NUMBER,
-                             field);
+  return ParseFieldSpecifics(
+      scanner, regex, MATCH_DEFAULT | MATCH_TELEPHONE | MATCH_NUMBER, field);
 }
 
 }  // namespace autofill