Add missing pref_registry dependency from dom_distiller

Otherwise, Windows Release incremental links fail with:

dom_distiller_core.distilled_page_prefs.obj : error LNK2019: unresolved external symbol "public: void __thiscall user_prefs::PrefRegistrySyncable::RegisterIntegerPref(char const *,int,enum user_prefs::PrefRegistrySyncable::PrefSyncStatus)" (?RegisterIntegerPref@PrefRegistrySyncable@user_prefs@@QAEXPBDHW4PrefSyncStatus@12@@Z) referenced in function "public: static void __cdecl dom_distiller::DistilledPagePrefs::RegisterProfilePrefs(class user_prefs::PrefRegistrySyncable *)" (?RegisterProfilePrefs@DistilledPagePrefs@dom_distiller@@SAXPAVPrefRegistrySyncable@user_prefs@@@Z)

R=nyquist@chromium.org
BUG=404809

Review URL: https://codereview.chromium.org/496323003

Cr-Commit-Position: refs/heads/master@{#291513}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291513 0039d316-1c4b-4281-b951-d872f2087c98

components/dom_distiller.gypi

@@ -43,6 +43,7 @@
             'components_resources.gyp:components_resources',
             'components_strings.gyp:components_strings',
             'distilled_page_proto',
+            'pref_registry',
           ],
           'include_dirs': [
             '..',