Fix some assertion failures on Fuchsia

runtime/bin/loader.h

Index: runtime/bin/loader.h
diff --git a/runtime/bin/loader.h b/runtime/bin/loader.h
index 587eff2be65ca98398236cf5844ef2a07aafab18..75fb1ca601cda66216d7ad178ab515de9e505ade 100644
--- a/runtime/bin/loader.h
+++ b/runtime/bin/loader.h
@@ -29,9 +29,7 @@ class Loader {
                                      uint8_t** payload,
                                      intptr_t* payload_length);
 
-  static Dart_Handle ResolveAsFilePath(Dart_Handle url,
-                                       uint8_t** payload,
-                                       intptr_t* payload_length);
+  static void ResolveDependenciesAsFilePaths();
 
   // A static tag handler that hides all usage of a loader for an isolate.
   static Dart_Handle LibraryTagHandler(Dart_LibraryTag tag,
@@ -99,6 +97,9 @@ class Loader {
                                          uint8_t** payload,
                                          intptr_t* payload_length);
 
+  static Dart_Handle ResolveAsFilePath(Dart_Handle url, uint8_t** payload,
+                                       intptr_t* payload_length);
+
   // Send a request from the tag handler to the kernel isolate.
   void SendKernelRequest(Dart_LibraryTag tag, Dart_Handle url);