[crosperf] Clean up exceptions.
Found all instances of 'raise Exception' and changed them to raise
something slightly more specific. Changed a few 'except Exception'
statements appropriately as well.
BUG=chromium:566255
TEST=None
Change-Id: If2666bd55838342bc71431e5e6ab2157c2c9e125
Reviewed-on: https://chrome-internal-review.googlesource.com/270731
Commit-Ready: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
Reviewed-by: Yunlian Jiang <yunlian@google.com>
26 files changed