Travis / chrome fixes

Travis / chrome fixes
- Use google-chrome-stable by default
- Use google-chrome-unstable as Canary (instead of trying to determine last-known-good-revision - we has issues with that yesterday)
- Test chrome stable and unstable separately on travis

Try bot:
https://travis-ci.org/dart-lang/sdk/builds/165541943

R=kevmoo@google.com

Committed: https://github.com/dart-lang/dev_compiler/commit/8846988b1dd81256938097c9d36bab644f39066d

[vsm, 2016-10-06 15:05:55]

Description was changed from

==========
Travis / chrome fixes
- Use google-chrome-stable by default
- Use google-chrome-unstable as Canary (instead of trying to determine
last-known-good-revision - we has issues with that yesterday)
- Test chrome stable and unstable separately on travis
==========

to

==========
Travis / chrome fixes
- Use google-chrome-stable by default
- Use google-chrome-unstable as Canary (instead of trying to determine
last-known-good-revision - we has issues with that yesterday)
- Test chrome stable and unstable separately on travis

Try bot:
https://travis-ci.org/dart-lang/sdk/builds/165541943
==========

[vsm, 2016-10-06 15:05:55]

vsm@google.com changed reviewers:
+ kevmoo@google.com, rnystrom@google.com

[vsm, 2016-10-06 15:07:30]

https://codereview.chromium.org/2396433007/diff/1/pkg/dev_compiler/tool/get_c...
File pkg/dev_compiler/tool/get_chrome_canary.sh (right):

https://codereview.chromium.org/2396433007/diff/1/pkg/dev_compiler/tool/get_c...
pkg/dev_compiler/tool/get_chrome_canary.sh:38: readonly CHROME_REV=$(curl -s
${CHROME_URL}/LAST_CHANGE)
Note - we don't use this file any more on travis.  Could delete it.  Maybe the
windows logic is useful?

[kevmoo, 2016-10-06 15:26:24]

lgtm

[vsm, 2016-10-06 15:33:13]

Description was changed from

==========
Travis / chrome fixes
- Use google-chrome-stable by default
- Use google-chrome-unstable as Canary (instead of trying to determine
last-known-good-revision - we has issues with that yesterday)
- Test chrome stable and unstable separately on travis

Try bot:
https://travis-ci.org/dart-lang/sdk/builds/165541943
==========

to

==========
Travis / chrome fixes
- Use google-chrome-stable by default
- Use google-chrome-unstable as Canary (instead of trying to determine
last-known-good-revision - we has issues with that yesterday)
- Test chrome stable and unstable separately on travis

Try bot:
https://travis-ci.org/dart-lang/sdk/builds/165541943

R=kevmoo@google.com

Committed:
https://github.com/dart-lang/dev_compiler/commit/8846988b1dd81256938097c9d36b...
==========

[vsm, 2016-10-06 15:33:14]

Committed patchset #1 (id:1) manually as
8846988b1dd81256938097c9d36bab644f39066d (presubmit successful).

[Bob Nystrom, 2016-10-06 16:07:13]

lgtm