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This allows the creator of the DistillerFactory to set the
DomDistillerOptions for all pages distilled by Distillers from that
factory.

Add an option to the content_extractor to extract just the text from the
page.

DEPENDSON= https://codereview.chromium.org/270663005/ https://codereview.chromium.org/286453002/

Review URL: https://codereview.chromium.org/286583002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272431 0039d316-1c4b-4281-b951-d872f2087c98