test(angular_spec): sort symbols and remove duplicates

We end up with duplicate entries (e.g.
angular.formatter_internal.FormatterModule) with a large unsorted list. 
Sort the list of symbols and remove duplicates.

Author: chirayuk

test/angular_spec.dart

@@ -147,6 +147,8 @@ main() {
         "angular.core.dom_internal.ViewCache",
         "angular.core.dom_internal.ViewFactory",
         "angular.core.dom_internal.ViewPort",
+        "angular.core.parser.Parser",
+        "angular.core.parser.dynamic_parser.ClosureMap",
         "angular.core_internal.ExceptionHandler",
         "angular.core_internal.Interpolate",
         "angular.core_internal.RootScope",
@@ -158,8 +160,6 @@ main() {
         "angular.core_internal.ScopeStatsConfig",
         "angular.core_internal.ScopeStatsEmitter",
         "angular.core_internal.VmTurnZone",
-        "angular.core.parser.dynamic_parser.ClosureMap",
-        "angular.core.parser.Parser",
         "angular.directive.AHref",
         "angular.directive.ContentEditable",
         "angular.directive.DirectiveModule",
@@ -188,7 +188,6 @@ main() {
         "angular.directive.NgIf",
         "angular.directive.NgInclude",
         "angular.directive.NgModel",
-        "angular.directive.NgModelOptions",
         "angular.directive.NgModelColorValidator",
         "angular.directive.NgModelConverter",
         "angular.directive.NgModelEmailValidator",
@@ -197,6 +196,7 @@ main() {
         "angular.directive.NgModelMinLengthValidator",
         "angular.directive.NgModelMinNumberValidator",
         "angular.directive.NgModelNumberValidator",
+        "angular.directive.NgModelOptions",
         "angular.directive.NgModelPatternValidator",
         "angular.directive.NgModelRequiredValidator",
         "angular.directive.NgModelUrlValidator",
@@ -217,15 +217,14 @@ main() {
         "angular.directive.NgValidator",
         "angular.directive.NgValue",
         "angular.directive.OptionValue",
-        "angular.formatter_internal.FormatterModule",
+        "angular.formatter_internal.Arrayify",
         "angular.formatter_internal.Currency",
         "angular.formatter_internal.Date",
         "angular.formatter_internal.Filter",
         "angular.formatter_internal.FormatterModule",
         "angular.formatter_internal.Json",
         "angular.formatter_internal.LimitTo",
         "angular.formatter_internal.Lowercase",
-        "angular.formatter_internal.Arrayify",
         "angular.formatter_internal.Number",
         "angular.formatter_internal.OrderBy",
         "angular.formatter_internal.Stringify",
@@ -238,7 +237,6 @@ main() {
         "angular.introspection.ngScope",
         "angular.node_injector.DirectiveInjector",
         "angular.routing.NgBindRoute",
-        "angular.routing.ngRoute",
         "angular.routing.NgRouteCfg",
         "angular.routing.NgRoutingHelper",
         "angular.routing.NgRoutingUsePushState",
@@ -248,6 +246,7 @@ main() {
         "angular.routing.RouteProvider",
         "angular.routing.RouteViewFactory",
         "angular.routing.RoutingModule",
+        "angular.routing.ngRoute",
         "angular.tracing.traceAsyncEnd",
         "angular.tracing.traceAsyncStart",
         "angular.tracing.traceCreateScope",
@@ -262,21 +261,21 @@ main() {
         "angular.watch_group.Watch",
         "change_detection.AvgStopwatch",
         "change_detection.FieldGetterFactory",
-        "di.key.Key",
-        "di.key.key",
+        "di.annotations.Injectable",
+        "di.annotations.Injectables",
+        "di.errors.CircularDependencyError",
+        "di.errors.DynamicReflectorError",
+        "di.errors.NoGeneratedTypeFactoryError",
+        "di.errors.NoProviderError",
+        "di.errors.ResolvingError",
         "di.injector.Injector",
         "di.injector.ModuleInjector",
-        "di.module.Module",
+        "di.key.Key",
+        "di.key.key",
         "di.module.Binding",
         "di.module.DEFAULT_VALUE",
+        "di.module.Module",
         "di.reflector.TypeReflector",
-        "di.errors.ResolvingError",
-        "di.errors.CircularDependencyError",
-        "di.errors.NoProviderError",
-        "di.errors.DynamicReflectorError",
-        "di.errors.NoGeneratedTypeFactoryError",
-        "di.annotations.Injectable",
-        "di.annotations.Injectables",
         "route.client.Routable",
         "route.client.Route",
         "route.client.RouteEnterEvent",
@@ -290,8 +289,8 @@ main() {
         "route.client.RoutePreEnterEventHandler",
         "route.client.RoutePreLeaveEvent",
         "route.client.RoutePreLeaveEventHandler",
-        "route.client.Router",
         "route.client.RouteStartEvent",
+        "route.client.Router",
         "url_matcher.UrlMatch",
         "url_matcher.UrlMatcher"
       ];