Cleanups in the Mojo package.

mojo/dart/packages/mojo/lib/src/handle.dart

Index: mojo/dart/packages/mojo/lib/src/handle.dart
diff --git a/mojo/dart/packages/mojo/lib/src/handle.dart b/mojo/dart/packages/mojo/lib/src/handle.dart
index 3c98ff491fccbe8d7dab4567c31db693a6c7f84e..908fa02153c871e238247154ba17bc913226dc07 100644
--- a/mojo/dart/packages/mojo/lib/src/handle.dart
+++ b/mojo/dart/packages/mojo/lib/src/handle.dart
@@ -5,8 +5,8 @@
 part of core;
 
 class MojoHandle {
-  static const int INVALID = 0;
-  static const int DEADLINE_INDEFINITE = -1;
+  static const int invalidHandle = MojoConstants.kInvalidHandleToken;
+  static const int deadlineIndefinite = MojoConstants.kDeadlineIndefinite;
 
   int _h;
   int get h => _h;
@@ -17,12 +17,12 @@ class MojoHandle {
 
   MojoHandle._internal(this._h);
 
-  MojoHandle.invalid() : this._internal(INVALID);
+  MojoHandle.invalid() : this._internal(invalidHandle);
 
   int close() {
     MojoHandleNatives.removeOpenHandle(_h);
     int result = MojoHandleNatives.close(_h);
-    _h = INVALID;
+    _h = invalidHandle;
     return result;
   }
 
@@ -57,7 +57,7 @@ class MojoHandle {
 
   bool get readyRead => _ready(MojoHandleSignals.kPeerClosedReadable);
   bool get readyWrite => _ready(MojoHandleSignals.kWritable);
-  bool get isValid => (_h != INVALID);
+  bool get isValid => (_h != invalidHandle);
 
   String toString() {
     if (!isValid) {