Coverity PASS_BY_VALUE fix.

chrome/browser/ui/views/extensions/shell_window_views.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/ui/views/extensions/shell_window_views.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/common/extensions/extension.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 426 matching lines @@
 }
 
 void ShellWindowViews::UpdateWindowTitle() {
   window_->UpdateWindowTitle();
 }
 
 // static
 ShellWindow* ShellWindow::CreateImpl(Profile* profile,
                                      const extensions::Extension* extension,
                                      const GURL& url,
-                                     const ShellWindow::CreateParams params) {
+                                     const ShellWindow::CreateParams& params) {
   return new ShellWindowViews(profile, extension, url, params);
 }