Move more string_util functions to base namespace.

ui/base/l10n/l10n_util.cc

Index: ui/base/l10n/l10n_util.cc
diff --git a/ui/base/l10n/l10n_util.cc b/ui/base/l10n/l10n_util.cc
index 3191a51a17a5ee87d81e913e5316e03177081bce..a1695e94f92a97658f8549f6cabab0772dd04bfd 100644
--- a/ui/base/l10n/l10n_util.cc
+++ b/ui/base/l10n/l10n_util.cc
@@ -614,7 +614,7 @@ bool IsValidLocaleSyntax(const std::string& locale) {
   // underscore.
   for (size_t i = 0; i < prefix.size(); i++) {
     char ch = prefix[i];
-    if (!IsAsciiAlpha(ch) && !IsAsciiDigit(ch) && ch != '_')
+    if (!base::IsAsciiAlpha(ch) && !base::IsAsciiDigit(ch) && ch != '_')
       return false;
   }
 
@@ -627,7 +627,7 @@ bool IsValidLocaleSyntax(const std::string& locale) {
         return false;
       break;
     }
-    if (!IsAsciiAlpha(ch))
+    if (!base::IsAsciiAlpha(ch))
       return false;
   }