Remove NullPointerException.

runtime/lib/object.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 
 namespace dart {
 
 DEFINE_NATIVE_ENTRY(Object_toString, 1) {
   const Instance& instance = Instance::CheckedHandle(arguments->NativeArgAt(0));
   const char* c_str = instance.ToCString();
   return String::New(c_str);
 }
 
 
 DEFINE_NATIVE_ENTRY(Object_noSuchMethod, 3) {
   const Instance& instance =
       Instance::CheckedHandle(arguments->NativeArgAt(0));
   GET_NATIVE_ARGUMENT(String, function_name, arguments->NativeArgAt(1));
   GET_NATIVE_ARGUMENT(Array, func_args, arguments->NativeArgAt(2));
   if (instance.IsNull()) {
     GrowableArray<const Object*> args;
     args.Add(&function_name);
     args.Add(&func_args);
-    Exceptions::ThrowByType(Exceptions::kNullPointer, args);
+    Exceptions::ThrowByType(Exceptions::kNullThrown, args);
   }
   const Object& null_object = Object::Handle(Object::null());
   GrowableArray<const Object*> dart_arguments(3);
   dart_arguments.Add(&instance);
   dart_arguments.Add(&function_name);
   dart_arguments.Add(&func_args);
   dart_arguments.Add(&null_object);
 
   // Report if a function with same name (but different arguments) has been
   // found.
@@ skipping 26 matching lines @@
 }
 
 
 DEFINE_NATIVE_ENTRY(AbstractType_toString, 1) {
   const AbstractType& type =
       AbstractType::CheckedHandle(arguments->NativeArgAt(0));
   return type.Name();
 }
 
 }  // namespace dart