Convert //components/prefs from scoped_ptr to std::unique_ptr

components/prefs/testing_pref_store.h

Index: components/prefs/testing_pref_store.h
diff --git a/components/prefs/testing_pref_store.h b/components/prefs/testing_pref_store.h
index 8fb4b8d2c24313311085cea0ffc281252d6f1a47..2bf2c8f72b113e8ac4b47be402efbe7df2ebc603 100644
--- a/components/prefs/testing_pref_store.h
+++ b/components/prefs/testing_pref_store.h
@@ -34,10 +34,10 @@ class TestingPrefStore : public PersistentPrefStore {
   bool GetMutableValue(const std::string& key, base::Value** result) override;
   void ReportValueChanged(const std::string& key, uint32_t flags) override;
   void SetValue(const std::string& key,
-                scoped_ptr<base::Value> value,
+                std::unique_ptr<base::Value> value,
                 uint32_t flags) override;
   void SetValueSilently(const std::string& key,
-                        scoped_ptr<base::Value> value,
+                        std::unique_ptr<base::Value> value,
                         uint32_t flags) override;
   void RemoveValue(const std::string& key, uint32_t flags) override;
   bool ReadOnly() const override;
@@ -107,7 +107,7 @@ class TestingPrefStore : public PersistentPrefStore {
   // mutation.
   bool committed_;
 
-  scoped_ptr<ReadErrorDelegate> error_delegate_;
+  std::unique_ptr<ReadErrorDelegate> error_delegate_;
   base::ObserverList<PrefStore::Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingPrefStore);