[Coverity] Convert pass-by-val to pass-by-ref

chrome/browser/extensions/script_executor_impl.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/extensions/script_executor_impl.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/pickle.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_macros.h"
 
 namespace extensions {
 
 namespace {
 
 const char* kRendererDestroyed = "The tab was closed.";
 
 // A handler for a single injection request. On creation this will send the
 // injection request to the renderer, and it will be destroyed after either the
 // corresponding response comes from the renderer, or the renderer is destroyed.
 class Handler : public content::WebContentsObserver {
  public:
   Handler(content::WebContents* web_contents,
-          const ExtensionMsg_ExecuteCode_Params params,
+          const ExtensionMsg_ExecuteCode_Params& params,
           const ScriptExecutor::ExecuteScriptCallback& callback)
           : content::WebContentsObserver(web_contents),
             request_id_(params.request_id),
             callback_(callback) {
     content::RenderViewHost* rvh = web_contents->GetRenderViewHost();
     rvh->Send(new ExtensionMsg_ExecuteCode(rvh->GetRoutingID(), params));
   }
 
   virtual ~Handler() {}
 
@@ skipping 58 matching lines @@
   params.code = code;
   params.all_frames = (frame_scope == ALL_FRAMES);
   params.run_at = (int) run_at;
   params.in_main_world = (world_type == MAIN_WORLD);
 
   // Handler handles IPCs and deletes itself on completion.
   new Handler(web_contents_, params, callback);
 }
 
 }  // namespace extensions