refactor(devtools): run ng-dev format on angular devtools files

Formats the entire devtools directory with the ng-dev formatting tool. Previously we relied on prettier, so this commit also remove prettier from devtools' dependencies.

devtools/src/iframe-message-bus.ts

@@ -1,11 +1,12 @@
-import { MessageBus, Events, Parameters } from 'protocol';
+import {Events, MessageBus, Parameters} from 'protocol';
 
 type AnyEventCallback<Ev> = <E extends keyof Ev>(topic: E, args: Parameters<Ev[E]>) => void;
 
 export class IFrameMessageBus extends MessageBus<Events> {
   private _listeners: any[] = [];
 
-  constructor(private _source: string, private _destination: string, private _docWindow: () => Window) {
+  constructor(
+      private _source: string, private _destination: string, private _docWindow: () => Window) {
     super();
   }
 
@@ -56,13 +57,12 @@ export class IFrameMessageBus extends MessageBus<Events> {
 
   emit<E extends keyof Events>(topic: E, args?: Parameters<Events[E]>): boolean {
     this._docWindow().postMessage(
-      {
-        source: this._source,
-        topic,
-        args,
-      },
-      '*'
-    );
+        {
+          source: this._source,
+          topic,
+          args,
+        },
+        '*');
     return true;
   }