Use window.navigator.vendor to detect chromium-based browsers (#1449)

* Use window.navigator.vendor to detect chromium-based browsers

Previously we used `window.navigator.userAgent` to detect if the
browser is chromium-based, but that detection fails during iphone
simulation in chrome or egde.

Change the detection to use `window.navigator.vendor` instead.

CLoses: flutter/flutter#92567

* Update changelog

Author: Anna Gringauze

dwds/CHANGELOG.md

@@ -11,6 +11,8 @@
   used by DDR, and is not yet supported for amd modules that are used by
   flutter tools and webdev.
 
+- Fix chrome detection in iPhone emulation mode in chrome or edge browsers.
+
 ## 11.4.0
 
 - Fix duplicated scripts returned by `VmService.getScripts` API.

dwds/lib/src/injected/client.js

@@ -223,4 +223,4 @@ external set emitDebugEvent(void Function(String, String) func);
 @JS(r'$emitRegisterEvent')
 external set emitRegisterEvent(void Function(String) func);
 
-bool get _isChromium => window.navigator.userAgent.contains('Chrome');
+bool get _isChromium => window.navigator.vendor.contains('Google');