Fix syntax error in builder_unittests and update broken tests

This patch adds a missing } from [1] which caused a syntax error and
prevented the builders unittests from running properly. With the
syntax error fixed, two test failures were exposed:

1) The "loading steps" test was failing because [1] changed the bot
base path to be hardcoded to "http://build.chromium.org/p/".
2) The "builders.master" test was failing because [1] changed the
bot names to be "chromium.webkit" and "chromium.win" instead of
"dummyurl" and "dummyurl2", respectively.

[1] https://src.chromium.org/viewvc/blink?view=rev&revision=176147

NOTRY=true

Review URL: https://codereview.chromium.org/392483002

git-svn-id: svn://svn.chromium.org/blink/trunk@178104 bbb929c8-8fbe-4397-9dbb-9b2b20218538