Remove a major source of flaky service test failures.

Remove a major source of flaky service test failures.

The first three bugs below have bug reports which indicate that they
will be fixed.  The bottom three bugs were filed without log
information, so it is impossible to know if they will be fixed or not,
but it is quite possible.

Closes #26470
Closes #28947
Closes #28605
Closes #28091
Closes #28184
Closes #28185

BUG=
R=johnmccutchan@google.com

Committed: https://github.com/dart-lang/sdk/commit/e60003d1a72c0fccf81357c6f522c637946d202f

[turnidge, 2017-02-02 22:48:50]

turnidge@google.com changed reviewers:
+ johnmccutchan@google.com

[Cutch, 2017-02-02 22:49:19]

lgtm

[turnidge, 2017-02-02 22:54:19]

Description was changed from

==========
Remove a major source of flaky service test failures.

The first three bugs below have bug reports which indicate that they
will be fixed.  The bottom three bugs were filed without log
information, so it is impossible to know if they will be fixed or not,
but it is quite possible.

Closes #26470
Closes #28947
Closes #28605
Closes #28091
Closes #28184
Closes #28185

BUG=
==========

to

==========
Remove a major source of flaky service test failures.

The first three bugs below have bug reports which indicate that they
will be fixed.  The bottom three bugs were filed without log
information, so it is impossible to know if they will be fixed or not,
but it is quite possible.

Closes #26470
Closes #28947
Closes #28605
Closes #28091
Closes #28184
Closes #28185

BUG=
R=johnmccutchan@google.com

Committed:
https://github.com/dart-lang/sdk/commit/e60003d1a72c0fccf81357c6f522c637946d202f
==========

[turnidge, 2017-02-02 22:54:20]

Committed patchset #1 (id:1) manually as
e60003d1a72c0fccf81357c6f522c637946d202f.