Update the Angular/DI tests to latest from github.

third_party/pkg/angular/lib/directive/ng_style.dart

 part of angular.directive;
 
 /**
-  * The `ngStyle` directive allows you to set CSS style on an HTML element conditionally.
+  * The `ngStyle` directive allows you to set CSS style on an HTML element
+  * conditionally.
   *
   * @example
-        <span ng-style="{color:'red'}">Sample Text</span>
+  *     <span ng-style="{color:'red'}">Sample Text</span>
   */
 @NgDirective(
     selector: '[ng-style]',
     map: const { 'ng-style': '@styleExpression'})
 class NgStyleDirective {
-  dom.Element _element;
-  Scope _scope;
+  final dom.Element _element;
+  final Scope _scope;
+  final AstParser _parser;
 
   String _styleExpression;
+  Watch _watch;
 
-  NgStyleDirective(this._element, this._scope);
-
-  Function _removeWatch = () => null;
-  var _lastStyles;
+  NgStyleDirective(this._element, this._scope, this._parser);
 
 /**
   * ng-style attribute takes an expression which evaluates to an
-  *      object whose keys are CSS style names and values are corresponding values for those CSS
-  *      keys.
+  * object whose keys are CSS style names and values are corresponding values
+  * for those CSS keys.
   */
   set styleExpression(String value) {
     _styleExpression = value;
-    _removeWatch();
-    _removeWatch = _scope.$watchCollection(_styleExpression, _onStyleChange);
+    if (_watch != null) _watch.remove();
+    _watch = _scope.watch(_parser(_styleExpression, collection: true), _onStyleChange);
   }
 
-  _onStyleChange(Map newStyles) {
-    dom.CssStyleDeclaration css = _element.style;
-    if (_lastStyles != null) {
-      _lastStyles.forEach((val, style) { css.setProperty(val, ''); });
-    }
-    _lastStyles = newStyles;
+  _onStyleChange(MapChangeRecord mapChangeRecord, _) {
+    if (mapChangeRecord != null) {
+      dom.CssStyleDeclaration css = _element.style;
+      fn(MapKeyValue kv) => css.setProperty(kv.key, kv.currentValue == null ? '' : kv.currentValue);
 
-    if (newStyles != null) {
-      newStyles.forEach((val, style) { css.setProperty(val, style); });
+      mapChangeRecord
+        ..forEachRemoval(fn)
+        ..forEachChange(fn)
+        ..forEachAddition(fn);
     }
   }
 }