QUIC - Cleanup changes found while sync'ing with internal code.
+ Fix indentation. Used LOG_IF. Fixed comments.

R=rch@chromium.org

Review URL: https://codereview.chromium.org/183663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254077 0039d316-1c4b-4281-b951-d872f2087c98
web_dev_style: suppress Promise#catch() issues in JS presubmit.

BUG=338301
R=tbreisacher@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/179233004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254078 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254078