autofill: switch autofill_regexes to RE2 library

components/autofill/core/browser/email_field.cc

Index: components/autofill/core/browser/email_field.cc
diff --git a/components/autofill/core/browser/email_field.cc b/components/autofill/core/browser/email_field.cc
index cfe4a1a187405a2fc068c42243a87bcb136a75c7..98ed4626889e089d43765a989891e0de129bb6f4 100644
--- a/components/autofill/core/browser/email_field.cc
+++ b/components/autofill/core/browser/email_field.cc
@@ -4,7 +4,6 @@
 
 #include "components/autofill/core/browser/email_field.h"
 
-#include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autofill_regex_constants.h"
 #include "components/autofill/core/browser/autofill_scanner.h"
 
@@ -13,8 +12,8 @@ namespace autofill {
 // static
 scoped_ptr<FormField> EmailField::Parse(AutofillScanner* scanner) {
   AutofillField* field;
-  if (ParseFieldSpecifics(scanner, base::UTF8ToUTF16(kEmailRe),
-                          MATCH_DEFAULT | MATCH_EMAIL, &field)) {
+  if (ParseFieldSpecifics(scanner, kEmailRe, MATCH_DEFAULT | MATCH_EMAIL,
+                          &field)) {
     return make_scoped_ptr(new EmailField(field));
   }