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

components/prefs/pref_service_unittest.cc

Index: components/prefs/pref_service_unittest.cc
diff --git a/components/prefs/pref_service_unittest.cc b/components/prefs/pref_service_unittest.cc
index 77ecd199fc9c88ad4f4dd594f2b754d6bf8995e7..ea9577726a9fce34d80fca28dece73ad0726e8a2 100644
--- a/components/prefs/pref_service_unittest.cc
+++ b/components/prefs/pref_service_unittest.cc
@@ -243,13 +243,13 @@ class WriteFlagChecker : public TestingPrefStore {
   }
 
   void SetValue(const std::string& key,
-                scoped_ptr<base::Value> value,
+                std::unique_ptr<base::Value> value,
                 uint32_t flags) override {
     SetLastWriteFlags(flags);
   }
 
   void SetValueSilently(const std::string& key,
-                        scoped_ptr<base::Value> value,
+                        std::unique_ptr<base::Value> value,
                         uint32_t flags) override {
     SetLastWriteFlags(flags);
   }
@@ -286,7 +286,7 @@ TEST(PrefServiceTest, WriteablePrefStoreFlags) {
   scoped_refptr<PrefRegistrySimple> registry(new PrefRegistrySimple);
   PrefServiceFactory factory;
   factory.set_user_prefs(flag_checker);
-  scoped_ptr<PrefService> prefs(factory.Create(registry.get()));
+  std::unique_ptr<PrefService> prefs(factory.Create(registry.get()));
 
   // The first 8 bits of write flags are reserved for subclasses. Create a
   // custom flag in this range