refactor: ensure compatibility with noImplicitOverride for examples

Adds the `override` keyword to the `examples` sources to ensure
compatibility with `noImplicitOverride`.

Author: devversion

packages/examples/compiler/ts/url_resolver/url_resolver.ts

@@ -16,7 +16,7 @@ class MyApp {
 }
 
 class MyUrlResolver extends UrlResolver {
-  resolve(baseUrl: string, url: string): string {
+  override resolve(baseUrl: string, url: string): string {
     // Serve CSS files from a special CDN.
     if (url.substr(-4) === '.css') {
       return super.resolve('http://cdn.myapp.com/css/', url);

packages/examples/core/di/ts/provider_spec.ts

@@ -62,7 +62,7 @@ import {Injectable, InjectionToken, Injector, Optional, ReflectiveInjector} from
         }
 
         class Square extends Shape {
-          name = 'square';
+          override name = 'square';
         }
 
         const injector = ReflectiveInjector.resolveAndCreate([{provide: Shape, useClass: Square}]);
@@ -80,7 +80,7 @@ import {Injectable, InjectionToken, Injector, Optional, ReflectiveInjector} from
         }
 
         class FormalGreeting extends Greeting {
-          salutation = 'Greetings';
+          override salutation = 'Greetings';
         }
 
         const injector = ReflectiveInjector.resolveAndCreate(
@@ -101,7 +101,7 @@ import {Injectable, InjectionToken, Injector, Optional, ReflectiveInjector} from
         }
 
         class Square extends Shape {
-          name = 'square';
+          override name = 'square';
         }
 
         const injector =
@@ -120,7 +120,7 @@ import {Injectable, InjectionToken, Injector, Optional, ReflectiveInjector} from
         }
 
         class FormalGreeting extends Greeting {
-          salutation = 'Greetings';
+          override salutation = 'Greetings';
         }
 
         const injector = Injector.create({
@@ -161,7 +161,7 @@ import {Injectable, InjectionToken, Injector, Optional, ReflectiveInjector} from
         }
 
         class FormalGreeting extends Greeting {
-          salutation = 'Greetings';
+          override salutation = 'Greetings';
         }
 
         const injector = Injector.create({