Remove the start() method from Service.

We are going to remove `start()` from `Page` soon, so it makes no sense to
have a new use of it.

Issue #130.

␄

Author: Mike Castle

Diff for: linkedin-tool.user.js

@@ -1668,11 +1668,6 @@
       throw new Error(msg);
     }
 
-    /** Called once when service is started. */
-    start() {
-      this.#notImplemented('start');
-    }
-
     /** Called each time service is activated. */
     activate() {
       this.#notImplemented('activate');
@@ -1688,11 +1683,6 @@
   /** Toy service for experimenting. */
   class DummyService extends Service {
 
-    /** @inheritdoc */
-    start() {
-      this.logger.log('Dummy start');
-    }
-
     /** @inheritdoc */
     activate() {
       this.logger.log('Dummy activate');
@@ -1719,11 +1709,6 @@
       this.#scroller = scroller;
     }
 
-    /** @inheritdoc */
-    start() {
-      this.logger.log('Scroller start, no-op');
-    }
-
     /** @inheritdoc */
     activate() {
       this.#scroller.activate();
@@ -1839,9 +1824,6 @@
       for (const shortcut of this.allShortcuts) {
         this.#addKey(shortcut);
       }
-      for (const service of this.#services) {
-        service.start();
-      }
     }
 
     /** @type {Shortcut[]} - List of {@link Shortcut}s to register. */