diff --git a/engine/src/flutter/sky/tools/packager/loader.cc b/engine/src/flutter/sky/tools/packager/loader.cc
index 9b5e0240c98..397eacb345d 100644
--- a/engine/src/flutter/sky/tools/packager/loader.cc
+++ b/engine/src/flutter/sky/tools/packager/loader.cc
@@ -57,16 +57,16 @@ Loader::Loader(const base::FilePath& package_root)
 }
 
 std::string Loader::CanonicalizePackageURL(std::string url) {
-  DCHECK(StartsWithASCII(url, "package:", true));
-  ReplaceFirstSubstringAfterOffset(&url, 0, "package:", "");
+  DCHECK(base::StartsWithASCII(url, "package:", true));
+  base::ReplaceFirstSubstringAfterOffset(&url, 0, "package:", "");
   return package_root_.Append(url).AsUTF8Unsafe();
 }
 
 Dart_Handle Loader::CanonicalizeURL(Dart_Handle library, Dart_Handle url) {
   std::string string = StringFromDart(url);
-  if (StartsWithASCII(string, "dart:", true))
+  if (base::StartsWithASCII(string, "dart:", true))
     return url;
-  if (StartsWithASCII(string, "package:", true))
+  if (base::StartsWithASCII(string, "package:", true))
     return StringToDart(CanonicalizePackageURL(string));
   base::FilePath base_path(StringFromDart(Dart_LibraryUrl(library)));
   base::FilePath resolved_path = base_path.DirName().Append(string);