Make various string_util functions take StringPieces instead of char[].

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 62509cbfbb553ce82534a435c894dc39aff0079e..c1b11d9709e9a14d2978a2713307f4abbef2582f 100644
--- a/components/autofill/core/browser/validation.cc
+++ b/components/autofill/core/browser/validation.cc
@@ -13,14 +13,6 @@
 #include "components/autofill/core/browser/credit_card.h"
 #include "components/autofill/core/browser/state_names.h"
 
-using base::StringPiece16;
-
-namespace {
-
-// The separator characters for SSNs.
-const base::char16 kSSNSeparators[] = {' ', '-', 0};
-
-}  // namespace
 
 namespace autofill {
 
@@ -156,7 +148,7 @@ bool IsValidZip(const base::string16& text) {
 
 bool IsSSN(const base::string16& text) {
   base::string16 number_string;
-  base::RemoveChars(text, kSSNSeparators, &number_string);
+  base::RemoveChars(text, base::ASCIIToUTF16("- "), &number_string);
 
   // A SSN is of the form AAA-GG-SSSS (A = area number, G = group number, S =
   // serial number). The validation we do here is simply checking if the area,
@@ -186,8 +178,8 @@ bool IsSSN(const base::string16& text) {
     return false;
 
   int area;
-  if (!base::StringToInt(StringPiece16(number_string.begin(),
-                                       number_string.begin() + 3),
+  if (!base::StringToInt(base::StringPiece16(number_string.begin(),
+                                             number_string.begin() + 3),
                          &area)) {
     return false;
   }
@@ -198,16 +190,16 @@ bool IsSSN(const base::string16& text) {
   }
 
   int group;
-  if (!base::StringToInt(StringPiece16(number_string.begin() + 3,
-                                       number_string.begin() + 5),
+  if (!base::StringToInt(base::StringPiece16(number_string.begin() + 3,
+                                             number_string.begin() + 5),
                          &group)
       || group == 0) {
     return false;
   }
 
   int serial;
-  if (!base::StringToInt(StringPiece16(number_string.begin() + 5,
-                                       number_string.begin() + 9),
+  if (!base::StringToInt(base::StringPiece16(number_string.begin() + 5,
+                                             number_string.begin() + 9),
                          &serial)
       || serial == 0) {
     return false;