Add proper API for creating private symbols wrt a library.

runtime/vm/resolver.cc

Index: runtime/vm/resolver.cc
diff --git a/runtime/vm/resolver.cc b/runtime/vm/resolver.cc
index 17028e1fc21f8ff4e8388322821db24dc2941e54..1b43064f5cca7a9fd511fd59266d98b3e19cb1d8 100644
--- a/runtime/vm/resolver.cc
+++ b/runtime/vm/resolver.cc
@@ -140,47 +140,6 @@ RawFunction* Resolver::ResolveDynamicAnyArgs(
 }
 
 
-// TODO(13355): Remove.
-RawFunction* Resolver::ResolveDynamicAnyArgsAllowPrivate(
-    const Class& receiver_class,
-    const String& function_name) {
-  Class& cls = Class::Handle(receiver_class.raw());
-  if (FLAG_trace_resolving) {
-    OS::Print("ResolveDynamic '%s' for class %s\n",
-              function_name.ToCString(),
-              String::Handle(cls.Name()).ToCString());
-  }
-
-  const bool is_getter = Field::IsGetterName(function_name);
-  String& field_name = String::Handle();
-  if (is_getter) {
-    field_name ^= Field::NameFromGetter(function_name);
-  }
-
-  // Now look for an instance function whose name matches function_name
-  // in the class.
-  Function& function = Function::Handle();
-  while (!cls.IsNull()) {
-    function ^= cls.LookupDynamicFunctionAllowPrivate(function_name);
-    if (!function.IsNull()) {
-      return function.raw();
-    }
-    // Getter invocation might actually be a method extraction.
-    if (is_getter && function.IsNull()) {
-      function ^= cls.LookupDynamicFunction(field_name);
-      if (!function.IsNull()) {
-        // We were looking for the getter but found a method with the same name.
-        // Create a method extractor and return it.
-        function ^= CreateMethodExtractor(function_name, function);
-        return function.raw();
-      }
-    }
-    cls = cls.SuperClass();
-  }
-  return function.raw();
-}
-
-
 RawFunction* Resolver::ResolveStatic(const Library& library,
                                      const String& class_name,
                                      const String& function_name,