Move ChromeRequirementsChecker to //extensions as a PreloadCheck

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 06617e6de89f4edbfc9f14c826b79ad6cb2be306..9338f19ea194da77bd703a8b7c0d2ceeba31ff37 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -654,7 +654,9 @@ void ExtensionService::LoadExtensionsFromCommandLineFlag(
       extensions::UnpackedInstaller::Create(this)->LoadFromCommandLine(
           base::FilePath(t.token()), &extension_id, false /*only-allow-apps*/);
       // Extension id is added to whitelist after its extension is loaded
-      // because code is executed asynchronously.
+      // because code is executed asynchronously. TODO(michaelpg): Remove this
+      // assumption so loading extensions does not have to be asynchronous:
+      // crbug.com/708354.
       if (switch_name == switches::kDisableExtensionsExcept)
         disable_flag_exempted_extensions_.insert(extension_id);
     }