Simplify isolate startup, push isolate init onto the prototype.

compiler/lib/implementation/isolate.js

Index: compiler/lib/implementation/isolate.js
===================================================================
--- compiler/lib/implementation/isolate.js	(revision 479)
+++ compiler/lib/implementation/isolate.js	(working copy)
@@ -4,7 +4,6 @@
 
 var isolate$current = null;
 var isolate$rootIsolate = null;  // Will only be set in the main worker.
-var isolate$inits = [];
 var isolate$globalThis = this;
 
 // These declarations are needed to avoid errors from the Closure Compiler
@@ -224,14 +223,6 @@
   this.token = new Object();
   this.token.hashCode = (Math.random() * 0xFFFFFFF) >>> 0;
   this.receivePorts = new isolate$Registry();
-  this.run(function() {
-    // The Dart-to-JavaScript compiler builds a list of functions that
-    // need to run for each isolate to setup the state of static
-    // variables. Run through the list and execute each function.
-    for (var i = 0, len = isolate$inits.length; i < len; i++) {
-      isolate$inits[i]();
-    }
-  });
 }
 
 // It is allowed to stack 'run' calls. The stacked isolates can be different.
@@ -377,7 +368,7 @@
 }
 
 function native_SendPortImpl__sendNow(message, replyTo) {
-  if (replyTo !== $Dart$Null && !(replyTo instanceof SendPortImpl$Dart)) {
+  if (replyTo !== $Dart$Null && !(replyTo.$implements$SendPortImpl$Dart)) {
     throw "SendPort::send: Illegal replyTo type.";
   }
   message = isolate$serializeMessage(message);