Don't use custom marshaller for ext host init data (#40169)

src/vs/workbench/node/extensionHostProcess.ts

@@ -7,7 +7,6 @@
 
 import { onUnexpectedError } from 'vs/base/common/errors';
 import { ExtensionHostMain, exit } from 'vs/workbench/node/extensionHostMain';
-import { parse } from 'vs/base/common/marshalling';
 import { IInitData } from 'vs/workbench/api/node/extHost.protocol';
 import { IMessagePassingProtocol } from 'vs/base/parts/ipc/common/ipc';
 import { Protocol } from 'vs/base/parts/ipc/node/ipc.net';
@@ -68,7 +67,7 @@ function connectToRenderer(protocol: IMessagePassingProtocol): Promise<IRenderer
 		const first = protocol.onMessage(raw => {
 			first.dispose();
 
-			const initData = parse(raw);
+			const initData = <IInitData>JSON.parse(raw);
 
 			// Print a console message when rejection isn't handled within N seconds. For details:
 			// see https://nodejs.org/api/process.html#process_event_unhandledrejection

src/vs/workbench/services/extensions/electron-browser/extensionHost.ts

@@ -7,7 +7,6 @@
 
 import * as nls from 'vs/nls';
 import { toErrorMessage } from 'vs/base/common/errorMessage';
-import { stringify } from 'vs/base/common/marshalling';
 import * as objects from 'vs/base/common/objects';
 import URI from 'vs/base/common/uri';
 import { TPromise } from 'vs/base/common/winjs.base';
@@ -329,7 +328,7 @@ export class ExtensionHostProcessWorker {
 
 					if (msg === 'ready') {
 						// 1) Extension Host is ready to receive messages, initialize it
-						this._createExtHostInitData().then(data => protocol.send(stringify(data)));
+						this._createExtHostInitData().then(data => protocol.send(JSON.stringify(data)));
 						return;
 					}