Remove raw DictionaryValue::Set in //chrome

chrome/test/chromedriver/chrome/devtools_client_impl.cc

Index: chrome/test/chromedriver/chrome/devtools_client_impl.cc
diff --git a/chrome/test/chromedriver/chrome/devtools_client_impl.cc b/chrome/test/chromedriver/chrome/devtools_client_impl.cc
index f814d2432f2c2813ccf8ebb4beb7dabbf73668dc..af6ef73cc18464f9182f52bb1c680786b8948e53 100644
--- a/chrome/test/chromedriver/chrome/devtools_client_impl.cc
+++ b/chrome/test/chromedriver/chrome/devtools_client_impl.cc
@@ -10,6 +10,7 @@
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "chrome/test/chromedriver/chrome/devtools_event_listener.h"
@@ -268,7 +269,7 @@ Status DevToolsClientImpl::SendCommandInternal(
   base::DictionaryValue command;
   command.SetInteger("id", command_id);
   command.SetString("method", method);
-  command.Set("params", params.DeepCopy());
+  command.Set("params", base::MakeUnique<base::Value>(params));
   std::string message = SerializeValue(&command);
   if (IsVLogOn(1)) {
     VLOG(1) << "DEVTOOLS COMMAND " << method << " (id=" << command_id << ") "