Switch `cronet_http` to use jnigen #780

Job	Run time
mono_repo self validate	25s
analyze_and_format; Dart 2.19.0; PKG: pkgs/http_client_conformance_tests; `dart analyze --fatal-i...	41s
analyze_and_format; Dart 3.0.0; PKG: pkgs/http; `dart analyze --fatal-infos`	26s
analyze_and_format; Dart dev; PKGS: pkgs/http, pkgs/http_client_conformance_tests; `dart analyze ...	36s
analyze_and_format; Dart dev; PKGS: pkgs/http, pkgs/http_client_conformance_tests; `dart format -...	34s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart test --platform chrome`	3m 6s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart test --platform vm`	44s
unit_test; Dart dev; PKG: pkgs/http; `dart run --define=no_default_http_client=true test/no_defau...	23s
unit_test; Dart 3.0.0; PKG: pkgs/http; `dart run --define=no_default_http_client=true test/no_def...	37s
unit_test; Dart dev; PKG: pkgs/http; `dart test --platform chrome`	2m 19s
unit_test; Dart dev; PKG: pkgs/http; `dart test --platform vm`	47s
	10m 38s

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