Parameterize the PrefService that AutofillDownloadManager uses.

components/autofill/core/browser/DEPS

 include_rules = [
   "+components/webdata/common",
   "+crypto/random.h",
   "+google_apis/gaia",
   "+google_apis/google_api_keys.h",
   "+net",
   "+sql",
   "+third_party/libjingle",
   "+third_party/libphonenumber",  # For phone number i18n.
 
@@ skipping 11 matching lines @@
   'test_autofill_driver.*': [
     # TODO(blundell): Eliminate the need for TestAutofillDriver to be a
     # WebContentsObserver.
     "!content/public/browser/web_contents_observer.h",
   ],
   '.*_[a-z]*test\.cc': [
     # TODO(blundell): Bring this list to zero.
     #
     # Do not add to the list of temporarily-allowed dependencies below,
     # and please do not introduce more #includes of these files.
+    "!components/user_prefs/user_prefs.h",
     "!content/public/browser/browser_thread.h",
     "!content/public/test",
 
     # TODO(joi): Bring this list to zero.
     #
     # Do not add to the list of temporarily-allowed dependencies below,
     # and please do not introduce more #includes of these files.
     "!chrome/browser/autofill/autofill_cc_infobar_delegate.h",
     "!chrome/browser/autofill/personal_data_manager_factory.h",
     "!chrome/browser/password_manager/password_manager.h",
     "!chrome/browser/password_manager/password_manager_delegate_impl.h",
     "!chrome/browser/profiles/profile.h",
     "!chrome/browser/sync/profile_sync_service.h",
     "!chrome/browser/sync/profile_sync_service_factory.h",
     "!chrome/browser/ui/autofill/tab_autofill_manager_delegate.h",
     "!chrome/browser/webdata/web_data_service_factory.h",
     "!chrome/common/chrome_paths.h",
     "!chrome/test/base/chrome_render_view_host_test_harness.h",
     "!chrome/test/base/testing_profile.h",
     "!third_party/WebKit/public/web/WebInputElement.h",
   ],
 }