Use std::unique_ptr<base::Value> in V8ValueConverter.

android_webview/renderer/aw_message_port_client.cc

Index: android_webview/renderer/aw_message_port_client.cc
diff --git a/android_webview/renderer/aw_message_port_client.cc b/android_webview/renderer/aw_message_port_client.cc
index 62def3d57240f792c1f486aa258b471ca8aae901..52e6ee72adeb4f7073b9144919ea4835396c0af9 100644
--- a/android_webview/renderer/aw_message_port_client.cc
+++ b/android_webview/renderer/aw_message_port_client.cc
@@ -4,6 +4,9 @@
 
 #include "android_webview/renderer/aw_message_port_client.h"
 
+#include <memory>
+#include <utility>
+
 #include "android_webview/common/aw_message_port_messages.h"
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/render_frame.h"
@@ -62,9 +65,9 @@ void AwMessagePortClient::OnWebToAppMessage(
   converter->SetDateAllowed(true);
   converter->SetRegExpAllowed(true);
   base::ListValue result;
-  base::Value* value = converter->FromV8Value(v8value, context);
+  std::unique_ptr<base::Value> value = converter->FromV8Value(v8value, context);
   if (value) {
-    result.Append(value);
+    result.Append(std::move(value));
   }
 
   Send(new AwMessagePortHostMsg_ConvertedWebToAppMessage(