Remove PrefValueStore's dependency on PrefModelAssociator.

chrome/browser/prefs/DEPS

Index: chrome/browser/prefs/DEPS
diff --git a/chrome/browser/prefs/DEPS b/chrome/browser/prefs/DEPS
index e3c761cbcb1c0b0daabeeed9fbd990f52b811629..612688f9f1e8db4c3412df7bd48c8ceb6efb7dfd 100644
--- a/chrome/browser/prefs/DEPS
+++ b/chrome/browser/prefs/DEPS
@@ -3,10 +3,13 @@ include_rules = [
 ]
 
 specific_include_rules = {
-  "(chrome_)?pref_service.*|browser_prefs.*": [
+  "chrome_pref_service_factory.*|pref_service_(unittest|mock|syncable).*|browser_prefs.*": [
     "+content/public/browser/browser_thread.h",
     "+content/public/browser/browser_context.h",
     "+content/public/browser/render_process_host.h",
     "+content/public/test",
   ],
+  "pref_value_store.*|pref_service(_simple)?\..*": [
+    "-chrome/browser/prefs/pref_model_associator.h",
+  ]
 }