refactor(core): Remove STOP_PROPAGATION define. (#55582)

This define has been removed at head, and now legacy stop propagation
behavior can be opted into at the LegacyDispatcher level, if necessary.

PR Close #55582

goldens/public-api/core/primitives/event-dispatch/index.md

@@ -46,8 +46,6 @@ export class EventContract implements UnrenamedEventContract {
  static MOUSE_SPECIAL_SUPPORT: boolean;
  registerDispatcher(dispatcher: Dispatcher_2, restriction: Restriction): void;
  replayEarlyEvents(): void;
- // (undocumented)
- static STOP_PROPAGATION: boolean;
 }
 
 // @public

packages/core/primitives/event-dispatch/src/event_contract_defines.ts

@@ -24,15 +24,6 @@ export const A11Y_CLICK_SUPPORT = false;
  */
 export const MOUSE_SPECIAL_SUPPORT = false;
 
-/**
- * @define Call stopPropagation on handled events. When integrating with
- * non-jsaction event handler based code, you will likely want to turn this flag
- * off. While most event handlers will continue to work, jsaction binds focus
- * and blur events in the capture phase and thus with stopPropagation, none of
- * your non-jsaction-handlers will ever see it.
- */
-export const STOP_PROPAGATION = true;
-
 /**
  * @define Support for custom events, which are type EventType.CUSTOM. These are
  * native DOM events with an additional type field and an optional payload.

packages/core/primitives/event-dispatch/src/eventcontract.ts

@@ -40,7 +40,6 @@ import {
  CUSTOM_EVENT_SUPPORT,
  JSNAMESPACE_SUPPORT,
  MOUSE_SPECIAL_SUPPORT,
- STOP_PROPAGATION,
 } from './event_contract_defines';
 import * as eventInfoLib from './event_info';
 import {EventType} from './event_type';
@@ -90,7 +89,6 @@ type EventHandler = (eventType: string, event: Event, container: Element) => voi
  */
 export class EventContract implements UnrenamedEventContract {
  static CUSTOM_EVENT_SUPPORT = CUSTOM_EVENT_SUPPORT;
- static STOP_PROPAGATION = STOP_PROPAGATION;
  static A11Y_CLICK_SUPPORT = A11Y_CLICK_SUPPORT;
  static MOUSE_SPECIAL_SUPPORT = MOUSE_SPECIAL_SUPPORT;
  static JSNAMESPACE_SUPPORT = JSNAMESPACE_SUPPORT;