remove client side ua parsing

example/pubspec.lock

@@ -50,13 +50,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.1"
-  csslib:
-    dependency: transitive
-    description:
-      name: csslib
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.17.1"
   dart_webrtc:
     dependency: transitive
     description:
@@ -191,13 +184,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.2.0"
-  html:
-    dependency: transitive
-    description:
-      name: html
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.15.0"
   http:
     dependency: transitive
     description:
@@ -497,20 +483,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
-  universal_html:
-    dependency: transitive
-    description:
-      name: universal_html
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.8"
-  universal_io:
-    dependency: transitive
-    description:
-      name: universal_io
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.4"
   uuid:
     dependency: transitive
     description:
@@ -525,13 +497,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.1"
-  web_browser_detect:
-    dependency: transitive
-    description:
-      name: web_browser_detect
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.2"
   webrtc_interface:
     dependency: transitive
     description: