Enforce the 'requirements' field in manifests.

chrome/browser/extensions/extension_system.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/extension_system.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/string_tokenizer.h"
@@ skipping 144 matching lines @@
   if (extensions_enabled) {
     // Load any extensions specified with --load-extension.
     // TODO(yoz): Seems like this should move into ExtensionService::Init.
     // But maybe it's no longer important.
     if (command_line->HasSwitch(switches::kLoadExtension)) {
       CommandLine::StringType path_list = command_line->GetSwitchValueNative(
           switches::kLoadExtension);
       StringTokenizerT<CommandLine::StringType,
           CommandLine::StringType::const_iterator> t(path_list,
                                                      FILE_PATH_LITERAL(","));
-      scoped_refptr<UnpackedInstaller> installer =
-          UnpackedInstaller::Create(extension_service_.get());
       while (t.GetNext()) {
-        installer->LoadFromCommandLine(FilePath(t.token()));
+        UnpackedInstaller::Create(extension_service_.get())->
+            LoadFromCommandLine(FilePath(t.token()));
       }
     }
   }
 
   // Make the chrome://extension-icon/ resource available.
   ChromeURLDataManager::AddDataSource(profile_,
       new ExtensionIconSource(profile_));
 
   // Initialize extension event routers. Note that on Chrome OS, this will
   // not succeed if the user has not logged in yet, in which case the
@@ skipping 215 matching lines @@
 void ExtensionSystemImpl::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const extension_misc::UnloadedExtensionReason reason) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&ExtensionInfoMap::RemoveExtension, info_map(),
                  extension_id, reason));
 }
 
 }  // namespace extensions