feat: deprecate @angular/http in favor of @angular/common/http (#18906)

As of 5.0, @angular/http is deprecated. @angular/common/http will
be the official HTTP API in Angular going forward.

PR Close #18906

packages/common/http/src/module.ts

@@ -23,7 +23,7 @@ import {HttpXsrfCookieExtractor, HttpXsrfInterceptor, HttpXsrfTokenExtractor, XS
  *
  * Meant to be used as a factory function within `HttpClientModule`.
  *
- * @experimental
+ * @stable
  */
 export function interceptingHandler(
     backend: HttpBackend, interceptors: HttpInterceptor[] | null = []): HttpHandler {
@@ -40,7 +40,7 @@ export function interceptingHandler(
  * Ordinarily JSONP callbacks are stored on the `window` object, but this may not exist
  * in test environments. In that case, callbacks are stored on an anonymous object instead.
  *
- * @experimental
+ * @stable
  */
 export function jsonpCallbackContext(): Object {
   if (typeof window === 'object') {
@@ -59,7 +59,7 @@ export function jsonpCallbackContext(): Object {
  * If no such names are provided, the default is to use `X-XSRF-TOKEN` for
  * the header name and `XSRF-TOKEN` for the cookie name.
  *
- * @experimental
+ * @stable
  */
 @NgModule({
   providers: [
@@ -107,7 +107,7 @@ export class HttpClientXsrfModule {
  * Interceptors can be added to the chain behind `HttpClient` by binding them
  * to the multiprovider for `HTTP_INTERCEPTORS`.
  *
- * @experimental
+ * @stable
  */
 @NgModule({
   imports: [
@@ -140,7 +140,7 @@ export class HttpClientModule {
  * Without this module, Jsonp requests will reach the backend
  * with method JSONP, where they'll be rejected.
  *
- * @experimental
+ * @stable
  */
 @NgModule({
   providers: [