Remove support for requests not made through dart:io Sockets #341

Job	Run time
analyze_and_format; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_...	40s
mono_repo self validate	23s
analyze_and_format; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_pr...	43s
analyze_and_format; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_pr...	29s
unit_test; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_proxy, pk...	1m 49s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-randomiz...	48s
unit_test; linux; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-random...	1m 33s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-randomiz...	1m 25s
unit_test; linux; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_packages_handler, pkgs/shelf_proxy, pkgs...	1m 42s
unit_test; linux; Dart dev; PKG: pkgs/shelf_router_generator; `dart test --run-skipped -t presubm...	54s
unit_test; windows; Dart 3.0.0; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-rand...	2m 30s
unit_test; windows; Dart 3.0.0; PKGS: pkgs/shelf_packages_handler, pkgs/shelf_static, pkgs/shelf_...	1m 15s
unit_test; windows; Dart dev; PKGS: pkgs/shelf, pkgs/shelf_test_handler; `dart test --test-random...	1m 52s
unit_test; windows; Dart dev; PKGS: pkgs/shelf_packages_handler, pkgs/shelf_static, pkgs/shelf_te...	1m 20s
	17m 23s

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