autofill: switch autofill_regexes to RE2 library

components/autofill/core/browser/validation.cc

Index: components/autofill/core/browser/validation.cc
diff --git a/components/autofill/core/browser/validation.cc b/components/autofill/core/browser/validation.cc
index b4c95674ebad46c819e0bbf4881977a180d3d004..f2f1a88a253b3ddb5b6ed4c209478930e4b8fcc1 100644
--- a/components/autofill/core/browser/validation.cc
+++ b/components/autofill/core/browser/validation.cc
@@ -127,9 +127,9 @@ bool IsValidCreditCardSecurityCode(const base::string16& code,
 
 bool IsValidEmailAddress(const base::string16& text) {
   // E-Mail pattern as defined by the WhatWG. (4.10.7.1.5 E-Mail state)
-  const base::string16 kEmailPattern = base::ASCIIToUTF16(
+  const char kEmailPattern[] =
       "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@"
-      "[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$");
+      "[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$";
   return MatchesPattern(text, kEmailPattern);
 }
 
@@ -139,7 +139,7 @@ bool IsValidState(const base::string16& text) {
 }
 
 bool IsValidZip(const base::string16& text) {
-  const base::string16 kZipPattern = base::ASCIIToUTF16("^\\d{5}(-\\d{4})?$");
+  const char kZipPattern[] = "^\\d{5}(-\\d{4})?$";
   return MatchesPattern(text, kZipPattern);
 }