Give instances their own model class; move DartErrors out of instance-ref into their own error-ref.

runtime/bin/vmservice/observatory/deployed/web/packages/web_components/platform.js

Index: runtime/bin/vmservice/observatory/deployed/web/packages/web_components/platform.js
diff --git a/runtime/bin/vmservice/observatory/deployed/web/packages/web_components/platform.js b/runtime/bin/vmservice/observatory/deployed/web/packages/web_components/platform.js
index 175609157a01cc6b2df4a3e1020119035a770628..17575313ab2223c426ba54a359ac63b5bbc0e30c 100644
--- a/runtime/bin/vmservice/observatory/deployed/web/packages/web_components/platform.js
+++ b/runtime/bin/vmservice/observatory/deployed/web/packages/web_components/platform.js
@@ -7,11 +7,11 @@
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version: 0.3.5-fe549bc
+// @version: 0.3.4-02a0f66
 
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b=[],c={},d=[];return Object.observe(c,a),Array.observe(d,a),c.id=1,c.id=2,delete c.id,d.push(1,2),d.length=0,Object.deliverChangeRecords(a),5!==b.length?!1:"add"!=b[0].type||"update"!=b[1].type||"delete"!=b[2].type||"splice"!=b[3].type||"splice"!=b[4].type?!1:(Object.unobserve(c,a),Array.unobserve(d,a),!0)}function detectEval(){if("undefined"!=typeof chrome&&chrome.app&&chrome.app.runtime)return!1;if(navigator.getDeviceStorage)return!1;try{var a=new Function("","return true;");return a()}catch(b){return!1}}function isIndex(a){return+a===a>>>0}function toNumber(a){return+a}function isObject(a){return a===Object(a)}function areSameValue(a,b){return a===b?0!==a||1/a===1/b:numberIsNaN(a)&&numberIsNaN(b)?!0:a!==a&&b!==b}function getPathCharType(a){if(void 0===a)return"eof";var b=a.charCodeAt(0);switch(b){case 91:case 93:case 46:case 34:case 39:case 48:return a;case 95:case 36:return"ident";case 32:case 9:case 10:case 13:case 160:case 65279:case 8232:case 8233:return"ws"}return 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