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disabled for most browser tests.

Also remove the option from about:flags.  It can still be
disabled via --captive-portal-detection=0 or by deselecting
"use a web service to resolve navigation errors".

BUG=87100

Review URL: https://chromiumcodereview.appspot.com/10795038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148764 0039d316-1c4b-4281-b951-d872f2087c98