Fix raise to use Exception instead of raw strings

Fix raise to use Exception instead of raw strings

I coded these incorrectly in a previous change and hit them when
building a VS package.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298156

[brucedawson, 2016-01-07 21:22:20]

brucedawson@chromium.org changed reviewers:
+ scottmg@chromium.org

[brucedawson, 2016-01-07 21:22:20]

Minor bug fix. PTAL.

[scottmg, 2016-01-07 21:32:34]

lgtm

[brucedawson, 2016-01-07 21:35:10]

The CQ bit was checked by brucedawson@chromium.org

[commit-bot: I haz the power, 2016-01-07 21:35:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1567863004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1567863004/1

[commit-bot: I haz the power, 2016-01-07 21:37:48]

Description was changed from

==========
Fix raise to use Exception instead of raw strings

I coded these incorrectly in a previous change and hit them when
building a VS package.
==========

to

==========
Fix raise to use Exception instead of raw strings

I coded these incorrectly in a previous change and hit them when
building a VS package.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298156
==========

[commit-bot: I haz the power, 2016-01-07 21:37:48]

Committed patchset #1 (id:1) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=298156