Refactor standalone tests to avoid including platform library code via parts Add testing only stubs to dart:_http, and make it available for use in the standalone tests so that the tests can stop including platform library code directly using "part" directives (which can cause surprising breakage, since the same code gets included twice via different uris). TEST=Existing tests Change-Id: I1b5a5061008ef36980bd21b46a9d0fd701286f66 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/262780 Reviewed-by: Kallen Tu <kallentu@google.com> Reviewed-by: Lasse Nielsen <lrn@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com>
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