Remove PrefObserver usage, batch 3.

chrome/browser/api/prefs/pref_member.h

Index: chrome/browser/api/prefs/pref_member.h
diff --git a/chrome/browser/api/prefs/pref_member.h b/chrome/browser/api/prefs/pref_member.h
index 5f3791cf19659585c7663c202e26f5d8ad278596..93942fd093016a97faec15a05595b9cc9d60d882 100644
--- a/chrome/browser/api/prefs/pref_member.h
+++ b/chrome/browser/api/prefs/pref_member.h
@@ -47,6 +47,9 @@ class PrefMemberBase : public PrefObserver {
   // the pref that is changing.
   typedef base::Callback<void(const std::string&)> NamedChangeCallback;
 
+  PrefServiceBase* prefs() { return prefs_; }
+  const PrefServiceBase* prefs() const { return prefs_; }
+
  protected:
   class Internal : public base::RefCountedThreadSafe<Internal> {
    public:
@@ -125,8 +128,6 @@ class PrefMemberBase : public PrefObserver {
   void VerifyPref() const;
 
   const std::string& pref_name() const { return pref_name_; }
-  PrefServiceBase* prefs() { return prefs_; }
-  const PrefServiceBase* prefs() const { return prefs_; }
 
   virtual Internal* internal() const = 0;