Net: Standardize HttpByteRange printing

BUG=318450
TBR=benm@chromium.org,sky@chromium.org

Review URL: https://codereview.chromium.org/78343004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237400 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237400