bug_chomper: Cleanup template initialization.
bug_chomper: Cleanup template initialization.

Use the same tricks used by webtry and perf. Code seems more robust and
easier to check for errors this way.

BUG=None
TEST=./run_server.sh, then navigate to 127.0.0.1:8000 and
127.0.0.1:8000/res
R=borenet@google.com

Review URL: https://codereview.chromium.org/661613004

Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot