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The trailing '\' on a comment line produces following error on gcc 4.8

chrome/browser/extensions/chrome_url_request_util.h:29:1:
    error: multi-line comment [-Werror=comment]

TBR=fsamuel@chromium.org, lfg@chromium.org, rockot@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/552103003

Cr-Commit-Position: refs/heads/master@{#295278}