Revert 55797 - Disable support of --enable-preconnect flag
Revert 55797 - Disable support of --enable-preconnect flag

The preconenct feature is still not fully implemented yet. We would like to
disable it for M6 as it is causing crashes. This is a temporary 'fix'.

BUG=48549
r=jar

Review URL: http://codereview.chromium.org/3140007

TBR=ziadh@chromium.org
Review URL: http://codereview.chromium.org/3161007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@55806 0039d316-1c4b-4281-b951-d872f2087c98

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