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

components/prefs/default_pref_store_unittest.cc

Index: components/prefs/default_pref_store_unittest.cc
diff --git a/components/prefs/default_pref_store_unittest.cc b/components/prefs/default_pref_store_unittest.cc
index 06cabc01b1471d7773b1c512f662740576225d73..af6a074857501e2432d0b9742f3eb48809bfaf42 100644
--- a/components/prefs/default_pref_store_unittest.cc
+++ b/components/prefs/default_pref_store_unittest.cc
@@ -54,17 +54,17 @@ TEST(DefaultPrefStoreTest, NotifyPrefValueChanged) {
 
   // Setting a default value shouldn't send a change notification.
   pref_store->SetDefaultValue(kPrefKey,
-                              scoped_ptr<Value>(new StringValue("foo")));
+                              std::unique_ptr<Value>(new StringValue("foo")));
   EXPECT_EQ(0, observer.change_count());
 
   // Replacing the default value should send a change notification...
-  pref_store->ReplaceDefaultValue(kPrefKey,
-                                  scoped_ptr<Value>(new StringValue("bar")));
+  pref_store->ReplaceDefaultValue(
+      kPrefKey, std::unique_ptr<Value>(new StringValue("bar")));
   EXPECT_EQ(1, observer.change_count());
 
   // But only if the value actually changed.
-  pref_store->ReplaceDefaultValue(kPrefKey,
-                                  scoped_ptr<Value>(new StringValue("bar")));
+  pref_store->ReplaceDefaultValue(
+      kPrefKey, std::unique_ptr<Value>(new StringValue("bar")));
   EXPECT_EQ(1, observer.change_count());
 }