Adding the --load-component-extension flag.

chrome/browser/extensions/extension_file_browser_private_api.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/extensions/extension_file_browser_private_api.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
@@ skipping 357 matching lines @@
 
  private:
 
   // Grants file system access permissions to file browser component.
   bool SetupFileSystemAccessPermissions() {
     if (!extension_.get())
       return false;
 
     // Make sure that only component extension can access the entire
     // local file system.
-    if (extension_->location() != Extension::COMPONENT
-#ifndef NDEBUG
-      && !CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kExposePrivateExtensionApi)
-#endif
+    if (extension_->location() != Extension::COMPONENT &&
+        !(extension_->location() == Extension::LOAD &&
+          CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kExposePrivateExtensionApi)
+         )
         ) {
       NOTREACHED() << "Private method access by non-component extension "
                    << extension_->id();
       return false;
     }
 
     fileapi::FileSystemPathManager* path_manager =
         profile_->GetFileSystemContext()->path_manager();
     fileapi::ExternalFileSystemMountPointProvider* provider =
         path_manager->external_provider();
@@ skipping 1282 matching lines @@
       l10n_util::GetStringUTF16(IDS_CERT_MANAGER_VIEW_CERT_BUTTON));
   dict->SetString("PLAY_MEDIA",
       l10n_util::GetStringUTF16(IDS_CONTENT_CONTEXT_PLAY));
 #if defined(OS_CHROMEOS)
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnablePhotoEditor))
     dict->SetString("ENABLE_PHOTO_EDITOR", "true");
 #endif
 
   return true;
 }