Convert Pass()→std::move() in //chrome

chrome/browser/tracing/chrome_tracing_delegate.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/tracing/chrome_tracing_delegate.h"
 
+#include <utility>
+
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/tracing/crash_service_uploader.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 126 matching lines @@
 void ChromeTracingDelegate::GenerateMetadataDict(
     base::DictionaryValue* metadata_dict) {
   DCHECK(metadata_dict);
   std::vector<std::string> variations;
   variations::GetFieldTrialActiveGroupIdsAsStrings(&variations);
 
   scoped_ptr<base::ListValue> variations_list(new base::ListValue());
   for (const auto& it : variations)
     variations_list->Append(new base::StringValue(it));
 
-  metadata_dict->Set("field-trials", variations_list.Pass());
+  metadata_dict->Set("field-trials", std::move(variations_list));
 }
 
 content::MetadataFilterPredicate
 ChromeTracingDelegate::GetMetadataFilterPredicate() {
   return base::Bind(&IsMetadataWhitelisted);
 }