fix(errors): require passing stack traces explicitly in ng2 own code

modules/angular2/test/render/dom/compiler/compiler_common_tests.js

@@ -219,7 +219,7 @@ class FakeTemplateLoader extends TemplateLoader {
       }
     }
 
-    return PromiseWrapper.reject('Load failed');
+    return PromiseWrapper.reject('Load failed', null);
   }
 }
 

modules/angular2/test/render/dom/shadow_dom/emulated_scoped_shadow_dom_strategy_spec.js

@@ -131,7 +131,7 @@ class FakeXHR extends XHR {
   get(url: string): Promise<string> {
     var response = MapWrapper.get(this._responses, url);
     if (isBlank(response)) {
-      return PromiseWrapper.reject('xhr error');
+      return PromiseWrapper.reject('xhr error', null);
     }
 
     return PromiseWrapper.resolve(response);

modules/angular2/test/render/dom/shadow_dom/style_inliner_spec.js

@@ -223,7 +223,7 @@ class FakeXHR extends XHR {
   get(url: string): Promise<string> {
     var response = MapWrapper.get(this._responses, url);
     if (isBlank(response)) {
-      return PromiseWrapper.reject('xhr error');
+      return PromiseWrapper.reject('xhr error', null);
     }
 
     return PromiseWrapper.resolve(response);