Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

chrome/browser/extensions/extension_override_apitest.cc

Index: chrome/browser/extensions/extension_override_apitest.cc
diff --git a/chrome/browser/extensions/extension_override_apitest.cc b/chrome/browser/extensions/extension_override_apitest.cc
index 96eee9e1696920d56fd71a29894870e6942ef573..ad91455c2af1b38c51521120f5220ade2b2762f7 100644
--- a/chrome/browser/extensions/extension_override_apitest.cc
+++ b/chrome/browser/extensions/extension_override_apitest.cc
@@ -39,7 +39,7 @@ class ExtensionOverrideTest : public ExtensionApiTest {
       return false;
 
     std::set<std::string> seen_overrides;
-    for (const base::Value* val : *values) {
+    for (const auto& val : *values) {
       const base::DictionaryValue* dict = nullptr;
       std::string entry;
       if (!val->GetAsDictionary(&dict) || !dict->GetString("entry", &entry) ||