Move EmptyString, kWhitespace and the BOM to base.

components/autofill/core/browser/autofill_field.cc

Index: components/autofill/core/browser/autofill_field.cc
diff --git a/components/autofill/core/browser/autofill_field.cc b/components/autofill/core/browser/autofill_field.cc
index bd905a5dcbff2701a7c691b62059bb3a51c68b04..f80774fbe81bf0b45daf142c0c2a757b50dcab97 100644
--- a/components/autofill/core/browser/autofill_field.cc
+++ b/components/autofill/core/browser/autofill_field.cc
@@ -169,15 +169,16 @@ bool FillCreditCardTypeSelectControl(const base::string16& value,
                                      FormFieldData* field) {
   // Try stripping off spaces.
   base::string16 value_stripped;
-  RemoveChars(StringToLowerASCII(value), kWhitespaceUTF16, &value_stripped);
+  RemoveChars(StringToLowerASCII(value), base::kWhitespaceUTF16,
+              &value_stripped);
 
   for (size_t i = 0; i < field->option_values.size(); ++i) {
     base::string16 option_value_lowercase;
-    RemoveChars(StringToLowerASCII(field->option_values[i]), kWhitespaceUTF16,
-                &option_value_lowercase);
+    RemoveChars(StringToLowerASCII(field->option_values[i]),
+                base::kWhitespaceUTF16, &option_value_lowercase);
     base::string16 option_contents_lowercase;
-    RemoveChars(StringToLowerASCII(field->option_contents[i]), kWhitespaceUTF16,
-                &option_contents_lowercase);
+    RemoveChars(StringToLowerASCII(field->option_contents[i]),
+                base::kWhitespaceUTF16, &option_contents_lowercase);
 
     // Perform a case-insensitive comparison; but fill the form with the
     // original text, not the lowercased version.