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Rather than AutofillDownloadManager obtaining the PrefService to use from
BrowserContext, have AutofillDownloadManager's creator supply it with the
PrefService to use. Incremental step toward abstracting BrowserContext
knowledge out of AutofillDownloadManager.

BUG=303050

Review URL: https://codereview.chromium.org/49303005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233375 0039d316-1c4b-4281-b951-d872f2087c98