autofill: switch autofill_regexes to RE2 library

components/autofill/core/browser/form_field.h

Index: components/autofill/core/browser/form_field.h
diff --git a/components/autofill/core/browser/form_field.h b/components/autofill/core/browser/form_field.h
index c27dc0896501289068f544ae65f7503bf372710c..1b1248e30ed9bcd86946c6cdded4dfbd8354ffeb 100644
--- a/components/autofill/core/browser/form_field.h
+++ b/components/autofill/core/browser/form_field.h
@@ -69,7 +69,7 @@ class FormField {
   // Attempts to parse a form field with the given pattern.  Returns true on
   // success and fills |match| with a pointer to the field.
   static bool ParseField(AutofillScanner* scanner,
-                         const base::string16& pattern,
+                         const std::string& pattern,
                          AutofillField** match);
 
   // Parses the stream of fields in |scanner| with regular expression |pattern|
@@ -78,7 +78,7 @@ class FormField {
   // A |true| result is returned in the case of a successful match, false
   // otherwise.
   static bool ParseFieldSpecifics(AutofillScanner* scanner,
-                                  const base::string16& pattern,
+                                  const std::string& pattern,
                                   int match_type,
                                   AutofillField** match);
 
@@ -89,7 +89,7 @@ class FormField {
   // change.
   static ParseNameLabelResult ParseNameAndLabelSeparately(
       AutofillScanner* scanner,
-      const base::string16& pattern,
+      const std::string& pattern,
       int match_type,
       AutofillField** match);
 
@@ -123,14 +123,14 @@ class FormField {
   // Returns |true| if a match is found according to |match_type|, and |false|
   // otherwise.
   static bool MatchAndAdvance(AutofillScanner* scanner,
-                              const base::string16& pattern,
+                              const std::string& pattern,
                               int match_type,
                               AutofillField** match);
 
   // Matches the regular expression |pattern| against the components of |field|
   // as specified in the |match_type| bit field (see |MatchType|).
   static bool Match(const AutofillField* field,
-                    const base::string16& pattern,
+                    const std::string& pattern,
                     int match_type);
 
   // Perform a "pass" over the |fields| where each pass uses the supplied