Change Dart_DefaultCanonicalizeUrl to accept the library url string instead of a library, this is u…

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 1a0fab6568ba112cc25b82fecb27c5ede29ba18e..04790459c56fffc64639e5501a29d2c074acb2f0 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -5171,22 +5171,21 @@ DART_EXPORT Dart_Handle Dart_SetLibraryTagHandler(
 }
 
 
-DART_EXPORT Dart_Handle Dart_DefaultCanonicalizeUrl(Dart_Handle library,
+DART_EXPORT Dart_Handle Dart_DefaultCanonicalizeUrl(Dart_Handle library_url,
                                                     Dart_Handle url) {
   API_TIMELINE_DURATION;
   DARTSCOPE(Thread::Current());
   CHECK_CALLBACK_STATE(T);
 
-  const Library& lib = Api::UnwrapLibraryHandle(Z, library);
-  if (lib.IsNull()) {
-    RETURN_TYPE_ERROR(Z, library, Library);
+  const String& lib_uri = Api::UnwrapStringHandle(Z, library_url);
+  if (lib_uri.IsNull()) {
+    RETURN_TYPE_ERROR(Z, library_url, String);
   }
   const String& uri = Api::UnwrapStringHandle(Z, url);
   if (uri.IsNull()) {
     RETURN_TYPE_ERROR(Z, url, String);
   }
 
-  const String& lib_uri = String::Handle(Z, lib.url());
   const char* resolved_uri;
   if (!ResolveUri(uri.ToCString(), lib_uri.ToCString(), &resolved_uri)) {
     return Api::NewError("%s: Unable to canonicalize uri '%s'.",