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

chrome/test/chromedriver/performance_logger.cc

Index: chrome/test/chromedriver/performance_logger.cc
diff --git a/chrome/test/chromedriver/performance_logger.cc b/chrome/test/chromedriver/performance_logger.cc
index 4b264546756044ba1b50bb898ea4271e9b1fc64a..e67074fb645eac0fb74ffc86c67f7f4294f45cc4 100644
--- a/chrome/test/chromedriver/performance_logger.cc
+++ b/chrome/test/chromedriver/performance_logger.cc
@@ -181,7 +181,7 @@ Status PerformanceLogger::HandleTraceEvents(
       return Status(kUnknownError,
                     "received DevTools trace data in unexpected format");
     }
-    for (base::Value* const trace : *traces) {
+    for (const auto& trace : *traces) {
       base::DictionaryValue* event_dict;
       if (!trace->GetAsDictionary(&event_dict))
         return Status(kUnknownError, "trace event must be a dictionary");