Rewrite simple uses of base::ListValue::Append() taking a raw pointer var.

extensions/browser/api/serial/serial_apitest.cc

Index: extensions/browser/api/serial/serial_apitest.cc
diff --git a/extensions/browser/api/serial/serial_apitest.cc b/extensions/browser/api/serial/serial_apitest.cc
index 0e1ec67916268bfc5b58ee000b127388dd8ef7a0..14fbabbd832071a7374667f181fcb56950a6c2e6 100644
--- a/extensions/browser/api/serial/serial_apitest.cc
+++ b/extensions/browser/api/serial/serial_apitest.cc
@@ -31,12 +31,12 @@ class FakeSerialGetDevicesFunction : public AsyncExtensionFunction {
  public:
   bool RunAsync() override {
     std::unique_ptr<base::ListValue> devices(new base::ListValue());
-    base::DictionaryValue* device0 = new base::DictionaryValue();
+    std::unique_ptr<base::DictionaryValue> device0(new base::DictionaryValue());
     device0->SetString("path", "/dev/fakeserial");
-    base::DictionaryValue* device1 = new base::DictionaryValue();
+    std::unique_ptr<base::DictionaryValue> device1(new base::DictionaryValue());
     device1->SetString("path", "\\\\COM800\\");
-    devices->Append(device0);
-    devices->Append(device1);
+    devices->Append(std::move(device0));
+    devices->Append(std::move(device1));
     SetResult(std::move(devices));
     SendResponse(true);
     return true;