The warning is 

> (electron:23955): Gtk-WARNING **: 10:41:01.876: gtk_disable_setlocale() must be called before gtk_init()

Looks like this is caused by gtk_init() being accidentally called twice.

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### Issue Details

* **Electron Version:**
  * 7-0-x, v8.0.0-nightly.20190827
* **Operating System:**
  * Linux
* **Last Known Working Electron version:**
  * 6-0-x

shell/browser/atom_browser_main_parts.cc
// Run user's main script efore most things get initialized, so we can have
  // a chance to setup everything.
  node_indings_->PrepareMessageLoop();
  node_indings_->RunMessageLoop();
#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
  extensions_client_ = std::make_unique<AtomExtensionsClient>();
  extensions::ExtensionsClient::Set(extensions_client_.get());
  // BrowserContextKeyedAPIServiceFactories require an ExtensionsBrowserClient.
  ex
  extensions::ExtensionsBrowserClient::Set(extensions_rowser_client_.get());