Switch //components away from base::ListValue::Append(Value*) overload.

components/signin/core/browser/account_tracker_service.cc

Index: components/signin/core/browser/account_tracker_service.cc
diff --git a/components/signin/core/browser/account_tracker_service.cc b/components/signin/core/browser/account_tracker_service.cc
index e7fea611b2b1f427e795435aab0235967a9f59e6..84f522a7eba699f59693d2a541f2a8fb1aaac0ee 100644
--- a/components/signin/core/browser/account_tracker_service.cc
+++ b/components/signin/core/browser/account_tracker_service.cc
@@ -9,6 +9,7 @@
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
@@ -405,7 +406,7 @@ void AccountTrackerService::SaveToPrefs(const AccountState& state) {
 
   if (!dict) {
     dict = new base::DictionaryValue();
-    update->Append(dict);  // |update| takes ownership.
+    update->Append(base::WrapUnique(dict));
     dict->SetString(kAccountKeyPath, account_id_16);
   }