Make observatory 'pub serve' work again in Dartium

Make observatory 'pub serve' work again in Dartium

pub serve in runtime/observatory with Dartium seems to have been broken
since c8e275537dd9288a423c3a432d417379a49c6a4a.

When I try to make observatory connect I just get a blank page.
If I open Dartiums console I get a *long* stacktrace saying
"Caught exception: String Expected".

BUG=
R=kmillikin@google.com

Committed: https://github.com/dart-lang/sdk/commit/1ba39faa3f2c5b1c13774939a925018ef537efbe

[jensj, 2017-03-02 14:39:54]

jensj@google.com changed reviewers:
+ kmillikin@google.com

[Kevin Millikin (Google), 2017-03-06 13:23:54]

LGTM.  Someone should probably look at the the other Analyzer warnings in
Observatory and make sure we think they are benign.

[jensj, 2017-03-07 07:21:37]

Description was changed from

==========
Make observatory 'pub serve' work again in Dartium

pub serve in runtime/observatory with Dartium seems to have been broken
since c8e275537dd9288a423c3a432d417379a49c6a4a.

When I try to make observatory connect I just get a blank page.
If I open Dartiums console I get a *long* stacktrace saying
"Caught exception: String Expected".

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

to

==========
Make observatory 'pub serve' work again in Dartium

pub serve in runtime/observatory with Dartium seems to have been broken
since c8e275537dd9288a423c3a432d417379a49c6a4a.

When I try to make observatory connect I just get a blank page.
If I open Dartiums console I get a *long* stacktrace saying
"Caught exception: String Expected".

BUG=
R=kmillikin@google.com

Committed:
https://github.com/dart-lang/sdk/commit/1ba39faa3f2c5b1c13774939a925018ef537efbe
==========

[jensj, 2017-03-07 07:21:39]

Committed patchset #1 (id:1) manually as
1ba39faa3f2c5b1c13774939a925018ef537efbe (presubmit successful).