Change `msg` to `message` in debugger function.

sdk/lib/developer/developer.dart

 // Copyright (c) 2015, 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.
 
 /// Interact with developer tools such as the debugger and inspector.
 ///
 /// The dart:developer library is _unstable_ and its API might change slightly
 /// as a result of developer feedback. This library is platform dependent and
 /// therefore it has implementations for both dart2js and the Dart VM. Both are
 /// under development and may not support all operations yet.
 ///
 library dart.developer;
 
 import 'dart:async';
 import 'dart:convert';
 
 part 'profiler.dart';
 
 /// If [when] is true, stop the program as if a breakpoint were hit at the
 /// following statement.
 ///
-/// Returns the value of [when]. Some debuggers may
-/// display [msg].
+/// Returns the value of [when]. Some debuggers may display [message].
 ///
 /// NOTE: When invoked, the isolate will not return until a debugger
 /// continues execution. When running in the Dart VM the behaviour is the same
 /// regardless of whether or not a debugger is connected. When compiled to
 /// JavaScript, this uses the "debugger" statement, and behaves exactly as
 /// that does.
-external bool debugger({bool when: true, String msg});
+external bool debugger({bool when: true, String message});
 
 /// Send a reference to [object] to any attached debuggers.
 ///
 /// Debuggers may open an inspector on the object. Returns the argument.
-external inspect(object);
+external Object inspect(Object object);
 
 /// Emit a log event.
+///
 /// [sequenceNumber] is a monotonically increasing sequence number.
 /// [millisececondsSinceEpoch] is a timestamp.
 /// [level] is the severity level (value between 0 and 2000 inclusive).
 /// [name] is the name of the source of the log message.
 /// [message] is the log message.
 /// [zone] (optional) the zone where the log was emitted
 /// [error] (optional) an error object associated with this log event.
 /// [stackTrace] (optional) a stack trace associated with this log event.
 external log({int sequenceNumber,
               int millisecondsSinceEpoch,
               int level,
               String name,
               String message,
               Zone zone,
               Object error,
               StackTrace stackTrace});