Move more string_util functions to base namespace.

components/autofill/core/common/save_password_progress_logger.cc

Index: components/autofill/core/common/save_password_progress_logger.cc
diff --git a/components/autofill/core/common/save_password_progress_logger.cc b/components/autofill/core/common/save_password_progress_logger.cc
index 6eb2563e2a16eb63a71ef44e1a1af6e7408e5d12..cfa3a58b42b468f3316361da6bb54fde034bffe0 100644
--- a/components/autofill/core/common/save_password_progress_logger.cc
+++ b/components/autofill/core/common/save_password_progress_logger.cc
@@ -35,7 +35,8 @@ std::string ScrubURL(const GURL& url) {
 // Returns true for all characters which we don't want to see in the logged IDs
 // or names of HTML elements.
 bool IsUnwantedInElementID(char c) {
-  return !(c == '_' || c == '-' || IsAsciiAlpha(c) || IsAsciiDigit(c));
+  return !(c == '_' || c == '-' ||
+           base::IsAsciiAlpha(c) || base::IsAsciiDigit(c));
 }
 
 // The UTF-8 version of SavePasswordProgressLogger::ScrubElementID.