Register SSLManager preferences on linux and mac.
Register SSLManager preferences on linux and mac.

This should fix the following error:
FATAL:common/pref_service.cc(314)] Check failed: false. Trying to read an unregistered pref: security.mixed_content_filtering

Review URL: http://codereview.chromium.org/39006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@10903 0039d316-1c4b-4281-b951-d872f2087c98

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