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The "Better Session Restore" features have been on by default for quite a while,
and there are no known problems.

This CL removes the effects of --disable-restore-session-state but keeps the
flag and the about:flags flag in place. New experimental features are ready to be
enabled by default, and this flag will be used again to disable them.

BUG=116947


Review URL: https://chromiumcodereview.appspot.com/10855022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150541 0039d316-1c4b-4281-b951-d872f2087c98