Use atob in execution env

Author: FrederikBolding

packages/snaps-execution-environments/src/webview/WebViewExecutorStream.ts

@@ -1,7 +1,6 @@
 import type { PostMessageEvent } from '@metamask/post-message-stream';
 import { BasePostMessageStream } from '@metamask/post-message-stream';
 import { isValidStreamMessage } from '@metamask/post-message-stream/dist/utils';
-import { base64ToBytes, bytesToString } from '@metamask/utils';
 
 type WebViewExecutorStreamArgs = {
   name: string;
@@ -66,8 +65,7 @@ export class WebViewExecutorStream extends BasePostMessageStream {
       return;
     }
 
-    const bytes = base64ToBytes(event.data);
-    const message = JSON.parse(bytesToString(bytes));
+    const message = JSON.parse(atob(event.data));
 
     // Notice that we don't check targetWindow or targetOrigin here.
     // This doesn't seem possible to do in RN.