Minor tweak to Session* to use base::Passed so ownership is clearer

chrome/browser/sessions/session_backend.cc

 // Copyright (c) 2012 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/sessions/session_backend.h"
 
 #include <limits>
 
 #include "base/files/file.h"
 #include "base/files/file_util.h"
@@ skipping 203 matching lines @@
 
   inited_ = true;
 
   // Create the directory for session info.
   base::CreateDirectory(path_to_dir_);
 
   MoveCurrentSessionToLastSession();
 }
 
 void SessionBackend::AppendCommands(
-    ScopedVector<SessionCommand>* commands,
+    ScopedVector<SessionCommand> commands,
     bool reset_first) {
   Init();
   // Make sure and check current_session_file_, if opening the file failed
   // current_session_file_ will be NULL.
   if ((reset_first && !empty_file_) || !current_session_file_.get() ||
       !current_session_file_->IsValid()) {
     ResetFile();
   }
   // Need to check current_session_file_ again, ResetFile may fail.
   if (current_session_file_.get() && current_session_file_->IsValid() &&
-      !AppendCommandsToFile(current_session_file_.get(), *commands)) {
+      !AppendCommandsToFile(current_session_file_.get(), commands)) {
     current_session_file_.reset(NULL);
   }
   empty_file_ = false;
-  // Deleting the ScopedVector will also delete its elements.
-  delete commands;
 }
 
 void SessionBackend::ReadLastSessionCommands(
     const base::CancelableTaskTracker::IsCanceledCallback& is_canceled,
     const BaseSessionService::InternalGetCommandsCallback& callback) {
   if (is_canceled.Run())
     return;
 
   Init();
 
@@ skipping 144 matching lines @@
 }
 
 base::FilePath SessionBackend::GetCurrentSessionPath() {
   base::FilePath path = path_to_dir_;
   if (type_ == BaseSessionService::TAB_RESTORE)
     path = path.AppendASCII(kCurrentTabSessionFileName);
   else
     path = path.AppendASCII(kCurrentSessionFileName);
   return path;
 }