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DevTools fails to launch with a confusing message if Chrome is not installed #1830

@g-yashwanth

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@g-yashwanth

I was running app and asked me to
bg
activate DevTools I just did it in vs code and some process was running and it popped up saying "The DevTools service failed to launch the browser. Please raise a bug against the Dart extension for VS Code. " and showed a bug report which is :

Failed to launch browser: ProcessException: The system cannot find the file specified.

Command: .\Google\Chrome\Application\chrome.exe http://127.0.0.1:56770/?hide=debugger&ide=VSCode&theme=dark&uri=http%3A%2F%2F127.0.0.1%3A57377%2FSVM_pXxEAVY%3D%2F
#0 Chrome._startProcess (package:browser_launcher/src/chrome.dart:128:12)

#1 Chrome.start (package:browser_launcher/src/chrome.dart:120:11)

#2 registerLaunchDevToolsService. (package:devtools_server/src/server.dart:238:24)

#3 VmService._routeRequest (package:vm_service_lib/vm_service_lib.dart:1631:39)

#4 VmService._processRequest (package:vm_service_lib/vm_service_lib.dart:1609:25)

#5 VmService._processMessageStr (package:vm_service_lib/vm_service_lib.dart:1577:9)
#6 VmService._processMessage (package:vm_service_lib/vm_service_lib.dart:1535:7)
#7 _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#8 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#9 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#10 _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:375:20)
#11 _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:250:5)
#12 _AsBroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:474:11)
#13 _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#14 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#15 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#16 _SyncStreamController._sendData (dart:async/stream_controller.dart:764:19)
#17 _StreamController._add (dart:async/stream_controller.dart:640:7)
#18 _StreamController.add (dart:async/stream_controller.dart:586:5)
#19 new _WebSocketImpl._fromSocket. (dart:_http/websocket_impl.dart:1138:21)
#20 _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#21 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#22 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#23 _SinkTransformerStreamSubscription._add (dart:async/stream_transformers.dart:68:11)
#24 _EventSinkWrapper.add (dart:async/stream_transformers.dart:15:11)
#25 _WebSocketProtocolTransformer._messageFrameEnd (dart:_http/websocket_impl.dart:334:22)
#26 _WebSocketProtocolTransformer.add (dart:_http/websocket_impl.dart:229:46)
#27 _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:120:24)
#28 _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#29 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#30 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#31 _SyncStreamController._sendData (dart:async/stream_controller.dart:764:19)
#32 _StreamController._add (dart:async/stream_controller.dart:640:7)
#33 _StreamController.add (dart:async/stream_controller.dart:586:5)
#34 _Socket._onData (dart:io-patch/socket_patch.dart:1774:41)
#35 _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#36 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#37 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#38 _SyncStreamController._sendData (dart:async/stream_controller.dart:764:19)
#39 _StreamController._add (dart:async/stream_controller.dart:640:7)
#40 _StreamController.add (dart:async/stream_controller.dart:586:5)
#41 new _RawSocket. (dart:io-patch/socket_patch.dart:1323:33)
#42 _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:844:14)
#43 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#44 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#45 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:115:13)
#46 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:5)

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