Coverity PASS_BY_VALUE fix.

chrome/browser/ui/extensions/shell_window.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/extensions/shell_window.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/extensions/shell_window_registry.h"
 #include "chrome/browser/file_select_helper.h"
@@ skipping 29 matching lines @@
 }  // namespace
 
 ShellWindow::CreateParams::CreateParams()
   : frame(ShellWindow::CreateParams::FRAME_CHROME),
     bounds(10, 10, kDefaultWidth, kDefaultHeight) {
 }
 
 ShellWindow* ShellWindow::Create(Profile* profile,
                                  const extensions::Extension* extension,
                                  const GURL& url,
-                                 const ShellWindow::CreateParams params) {
+                                 const ShellWindow::CreateParams& params) {
   // This object will delete itself when the window is closed.
   ShellWindow* window =
       ShellWindow::CreateImpl(profile, extension, url, params);
   ShellWindowRegistry::Get(profile)->AddShellWindow(window);
   return window;
 }
 
 ShellWindow::ShellWindow(Profile* profile,
                          const extensions::Extension* extension,
                          const GURL& url)
@@ skipping 145 matching lines @@
 }
 
 ExtensionWindowController* ShellWindow::GetExtensionWindowController() const {
   return NULL;
 }
 
 void ShellWindow::OnRequest(const ExtensionHostMsg_Request_Params& params) {
   extension_function_dispatcher_.Dispatch(params,
                                           web_contents_->GetRenderViewHost());
 }