Move IsStringASCII/UTF8 to base namespace.

chrome/browser/bookmarks/bookmark_codec.cc

Index: chrome/browser/bookmarks/bookmark_codec.cc
diff --git a/chrome/browser/bookmarks/bookmark_codec.cc b/chrome/browser/bookmarks/bookmark_codec.cc
index 05cd36a5deba4a0f683b75c58f7fa6952a0b3a7b..a5ae06bc1b97ed25e51f7e0e4a36ed95524842a4 100644
--- a/chrome/browser/bookmarks/bookmark_codec.cc
+++ b/chrome/browser/bookmarks/bookmark_codec.cc
@@ -464,7 +464,7 @@ void BookmarkCodec::UpdateChecksum(const base::string16& str) {
 void BookmarkCodec::UpdateChecksumWithUrlNode(const std::string& id,
                                               const base::string16& title,
                                               const std::string& url) {
-  DCHECK(IsStringUTF8(url));
+  DCHECK(base::IsStringUTF8(url));
   UpdateChecksum(id);
   UpdateChecksum(title);
   UpdateChecksum(kTypeURL);