autofill: switch autofill_regexes to RE2 library

components/autofill/core/common/autofill_regexes.h

Index: components/autofill/core/common/autofill_regexes.h
diff --git a/components/autofill/core/common/autofill_regexes.h b/components/autofill/core/common/autofill_regexes.h
index 1bf1aa73a6c51b9158a86d1e2e3185591f510e50..e5024ce9f3fafb1e5a3c78e356522520a6b7c852 100644
--- a/components/autofill/core/common/autofill_regexes.h
+++ b/components/autofill/core/common/autofill_regexes.h
@@ -5,6 +5,8 @@
 #ifndef COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_REGEXES_H_
 #define COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_REGEXES_H_
 
+#include <string>
+
 #include "base/strings/string16.h"
 
 // Parsing utilities.
@@ -13,7 +15,7 @@ namespace autofill {
 // Case-insensitive regular expression matching.
 // Returns true if |pattern| is found in |input|.
 bool MatchesPattern(const base::string16& input,
-                    const base::string16& pattern);
+                    const std::string& pattern);
 
 }  // namespace autofill