Clobber the state of the next-protocol-negotiation when disabling spdy.
Clobber the state of the next-protocol-negotiation when disabling spdy.

We basically have two sets of config for SPDY - one is a general enablement
flag, the other is the next-protocol advertisement.  We previously could
configure to advertise SPDY over NPN, but have SPDY disabled; this would lead
to the bug with broken 'download' when accessing a SPDY page.

BUG=66891
TEST=none



Review URL: http://codereview.chromium.org/6007002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@69891 0039d316-1c4b-4281-b951-d872f2087c98

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