Make GTK and Aura parts orthogonal to OS parts

chrome/browser/chrome_browser_main_gtk.h

Index: chrome/browser/chrome_browser_main_gtk.h
diff --git a/chrome/browser/chrome_browser_main_gtk.h b/chrome/browser/chrome_browser_main_gtk.h
index e55e4fe193888d48e8c287710de8e6b6d71c98de..832ee6cf1f5977881cf364647e5cfef9c7c00706 100644
--- a/chrome/browser/chrome_browser_main_gtk.h
+++ b/chrome/browser/chrome_browser_main_gtk.h
@@ -9,15 +9,16 @@
 #pragma once
 
 #include "base/compiler_specific.h"
-#include "chrome/browser/chrome_browser_main_posix.h"
-#include "chrome/browser/chrome_browser_main_x11.h"
+#include "chrome/browser/chrome_browser_main.h"
 
-class ChromeBrowserMainPartsGtk : public ChromeBrowserMainPartsPosix {
+class ChromeBrowserPartsGtk : public ChromeBrowserMainParts::ExtraParts {
  public:
-  explicit ChromeBrowserMainPartsGtk(const MainFunctionParams& parameters);
+  explicit ChromeBrowserPartsGtk(ChromeBrowserMainParts* main_parts);
 
   virtual void PreEarlyInitialization() OVERRIDE;
 
+  static void ShowMessageBox(const char* message);
+
  private:
   void DetectRunningAsRoot();
 };