Require explicit selection of traits for LazyInstance

net/base/mime_util.cc

Index: net/base/mime_util.cc
diff --git a/net/base/mime_util.cc b/net/base/mime_util.cc
index 4e94fa507e671c09f3a0078cee88e8c611b577b9..93aff23ad934e822f39cdd26e07efce1d0154494 100644
--- a/net/base/mime_util.cc
+++ b/net/base/mime_util.cc
@@ -48,7 +48,7 @@ class MimeUtil : public PlatformMimeUtil {
   bool IsValidTopLevelMimeType(const std::string& type_string) const;
 
  private:
-  friend struct base::DefaultLazyInstanceTraits<MimeUtil>;
+  friend struct base::LazyInstanceTraitsBase<MimeUtil>;
 
   MimeUtil();