Remove kDistroDict from Preferences.

chrome/browser/prefs/profile_pref_store_manager.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PREFS_PROFILE_PREF_STORE_MANAGER_H_
 #define CHROME_BROWSER_PREFS_PROFILE_PREF_STORE_MANAGER_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 74 matching lines @@
   // of the status of each tracked preference as they are checked.
   PersistentPrefStore* CreateProfilePrefStore(
       const scoped_refptr<base::SequencedTaskRunner>& io_task_runner,
       const base::Closure& on_reset_on_load,
       TrackedPreferenceValidationDelegate* validation_delegate);
 
   // Initializes the preferences for the managed profile with the preference
   // values in |master_prefs|. Acts synchronously, including blocking IO.
   // Returns true on success.
   bool InitializePrefsFromMasterPrefs(
-      const base::DictionaryValue& master_prefs);
+      std::unique_ptr<base::DictionaryValue> master_prefs);
 
   // Creates a single-file PrefStore as was used in M34 and earlier. Used only
   // for testing migration.
   PersistentPrefStore* CreateDeprecatedCombinedProfilePrefStore(
       const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
 
  private:
   // Returns a PrefHashStore for the managed profile. Should only be called
   // if |kPlatformSupportsPreferenceTracking|. |use_super_mac| determines
   // whether the returned object will calculate, store, and validate super MACs
@@ skipping 12 matching lines @@
       tracking_configuration_;
   const size_t reporting_ids_count_;
   const std::string seed_;
   const std::string legacy_device_id_;
   PrefService* local_state_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfilePrefStoreManager);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PROFILE_PREF_STORE_MANAGER_H_