CED (Compact Encoding Detection) is a better alternative to
ICU in terms of speed and accuracy. This CL switches the encoding
detection library to CED and fixes some of the failing cases.

BUG=630113
R=armansito@chromium.org, cbentzel@chromium.org, ellyjones@chromium.org, jshin@chromium.org, phajdan.jr@chromium.org, sievers@chromium.org, thestig@chromium.org

Review URL: https://codereview.chromium.org/2168003003 .

Cr-Commit-Position: refs/heads/master@{#411163}