Refactor resolution code in the vm to properly handle ambiguity errors.

runtime/vm/resolver_test.cc

Index: runtime/vm/resolver_test.cc
===================================================================
--- runtime/vm/resolver_test.cc	(revision 25291)
+++ runtime/vm/resolver_test.cc	(working copy)
@@ -102,7 +102,8 @@
                                 static_function_name,
                                 kNumArguments,
                                 Object::empty_array(),
-                                kResolveType));
+                                kResolveType,
+                                NULL));  // No ambiguity error expected.
     EXPECT(!function.IsNull());
     const Array& args = Array::Handle(Array::New(kNumArguments));
     const String& arg0 = String::Handle(String::New("junk"));
@@ -123,7 +124,8 @@
                                 static_function_name,
                                 kNumArguments,
                                 Object::empty_array(),
-                                kResolveType));
+                                kResolveType,
+                                NULL));  // No ambiguity error expected.
     EXPECT(bad_function.IsNull());
   }
 
@@ -139,7 +141,8 @@
                                 super_static_function_name,
                                 kNumArguments,
                                 Object::empty_array(),
-                                kResolveType));
+                                kResolveType,
+                                NULL));  // No ambiguity error expected.
     EXPECT(!super_function.IsNull());
   }
 }
@@ -162,7 +165,7 @@
   const Library& lib = Library::Handle(Library::LookupLibrary(lib_name));
   ASSERT(!lib.IsNull());
   const Class& cls = Class::Handle(lib.LookupClass(
-      String::Handle(Symbols::New(test_class_name))));
+      String::Handle(Symbols::New(test_class_name)), NULL));
   EXPECT(!cls.IsNull());
 
   Instance& receiver = Instance::Handle(Instance::New(cls));