base::ListValue::Append cleanup: pass unique_ptr instead of the released pointer.

chrome/browser/metrics/plugin_metrics_provider_unittest.cc

Index: chrome/browser/metrics/plugin_metrics_provider_unittest.cc
diff --git a/chrome/browser/metrics/plugin_metrics_provider_unittest.cc b/chrome/browser/metrics/plugin_metrics_provider_unittest.cc
index 0bc4f2341b149fcb05d04b1960eceaa82c681099..3582351ddd61c5235cfc6d6bbdf506cc1f44c3f0 100644
--- a/chrome/browser/metrics/plugin_metrics_provider_unittest.cc
+++ b/chrome/browser/metrics/plugin_metrics_provider_unittest.cc
@@ -7,6 +7,7 @@
 #include <stddef.h>
 
 #include <string>
+#include <utility>
 
 #include "base/macros.h"
 #include "base/run_loop.h"
@@ -96,7 +97,7 @@ TEST_F(PluginMetricsProviderTest, Plugins) {
   plugin_dict->SetInteger(prefs::kStabilityPluginLoadingErrors, 4);
   {
     ListPrefUpdate update(prefs(), prefs::kStabilityPluginStats);
-    update.Get()->Append(plugin_dict.release());
+    update.Get()->Append(std::move(plugin_dict));
   }
 
   provider.ProvideStabilityMetrics(&system_profile);