Don't show a prompt when loading an extension with NPAPI plugins via

chrome/browser/profiles/profile_impl.cc

 // Copyright (c) 2011 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/profiles/profile_impl.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
 #include "base/file_path.h"
@@ skipping 452 matching lines @@
       extensions_enabled));
 
   RegisterComponentExtensions();
   extension_service_->Init();
 
   if (extensions_enabled) {
     // Load any extensions specified with --load-extension.
     if (command_line->HasSwitch(switches::kLoadExtension)) {
       FilePath path = command_line->GetSwitchValuePath(
           switches::kLoadExtension);
-      extension_service_->LoadExtension(path);
+      extension_service_->LoadExtensionFromCommandLine(path);
     }
   }
 
   // Make the chrome://extension-icon/ resource available.
   GetChromeURLDataManager()->AddDataSource(new ExtensionIconSource(this));
 }
 
 void ProfileImpl::RegisterComponentExtensions() {
   // Register the component extensions.
   //
@@ skipping 1168 matching lines @@
   if (!prerender::PrerenderManager::IsPrerenderingPossible())
     return NULL;
   if (!prerender_manager_.get()) {
     CHECK(g_browser_process->prerender_tracker());
     prerender_manager_.reset(
         new prerender::PrerenderManager(
             this, g_browser_process->prerender_tracker()));
   }
   return prerender_manager_.get();
 }