fix(cdk/portal): remove deprecated symbols (#30584)

Removes some symbols that have been deprecated for a while.

BREAKING CHANGE:
* `DomPortalHost` has been removed. Use `DomPortalOutlet` instead.
* `PortalInjector` has been removed. Use `Injector.create` instead.
* `PortalHost` has been removed. Use `PortalOutlet` instead.
* `BasePortalHost` has been removed. Use `BasePortalOutlet` instead.

Author: crisbeto

src/cdk/portal/dom-portal-outlet.ts

@@ -166,9 +166,3 @@ export class DomPortalOutlet extends BasePortalOutlet {
     return (componentRef.hostView as EmbeddedViewRef<any>).rootNodes[0] as HTMLElement;
   }
 }
-
-/**
- * @deprecated Use `DomPortalOutlet` instead.
- * @breaking-change 9.0.0
- */
-export class DomPortalHost extends DomPortalOutlet {}

src/cdk/portal/portal-injector.ts

@@ -180,12 +180,6 @@ export interface PortalOutlet {
   hasAttached(): boolean;
 }
 
-/**
- * @deprecated Use `PortalOutlet` instead.
- * @breaking-change 9.0.0
- */
-export type PortalHost = PortalOutlet;
-
 /**
  * Partial implementation of PortalOutlet that handles attaching
  * ComponentPortal and TemplatePortal.
@@ -281,9 +275,3 @@ export abstract class BasePortalOutlet implements PortalOutlet {
     }
   }
 }
-
-/**
- * @deprecated Use `BasePortalOutlet` instead.
- * @breaking-change 9.0.0
- */
-export abstract class BasePortalHost extends BasePortalOutlet {}

src/cdk/portal/portal.ts

@@ -9,4 +9,3 @@
 export * from './portal';
 export * from './dom-portal-outlet';
 export * from './portal-directives';
-export * from './portal-injector';

src/cdk/portal/public-api.ts

@@ -16,10 +16,6 @@ import { OnInit } from '@angular/core';
 import { TemplateRef } from '@angular/core';
 import { ViewContainerRef } from '@angular/core';
 
-// @public @deprecated (undocumented)
-export abstract class BasePortalHost extends BasePortalOutlet {
-}
-
 // @public
 export abstract class BasePortalOutlet implements PortalOutlet {
     // (undocumented)
@@ -95,10 +91,6 @@ export class DomPortal<T = HTMLElement> extends Portal<T> {
     readonly element: T;
 }
 
-// @public @deprecated (undocumented)
-export class DomPortalHost extends DomPortalOutlet {
-}
-
 // @public
 export class DomPortalOutlet extends BasePortalOutlet {
     constructor(
@@ -119,9 +111,6 @@ export abstract class Portal<T> {
     setAttachedHost(host: PortalOutlet | null): void;
 }
 
-// @public @deprecated (undocumented)
-export type PortalHost = PortalOutlet;
-
 // @public @deprecated (undocumented)
 export class PortalHostDirective extends CdkPortalOutlet {
     // (undocumented)
@@ -130,13 +119,6 @@ export class PortalHostDirective extends CdkPortalOutlet {
     static ɵfac: i0.ɵɵFactoryDeclaration<PortalHostDirective, never>;
 }
 
-// @public @deprecated
-export class PortalInjector implements Injector {
-    constructor(_parentInjector: Injector, _customTokens: WeakMap<any, any>);
-    // (undocumented)
-    get(token: any, notFoundValue?: any): any;
-}
-
 // @public (undocumented)
 export class PortalModule {
     // (undocumented)