Revert of Linux Aura: Use Aura theme on all windows when 'Use Classic theme' is used

chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc

Index: chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc
diff --git a/chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc b/chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc
index 68ea2e4e198b8dafd9c3362507c0412bee90d187..eca7168a8f59585999f19927e095319ba5ab9e66 100644
--- a/chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc
+++ b/chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.cc
@@ -30,8 +30,14 @@
 namespace {
 
 ui::NativeTheme* GetNativeThemeForWindow(aura::Window* window) {
+  if (!window)
+    return nullptr;
+
   Profile* profile = nullptr;
-  if (window) {
+  // Window types not listed here (such as tooltips) will never use Chrome
+  // theming.
+  if (window->type() == ui::wm::WINDOW_TYPE_NORMAL ||
+      window->type() == ui::wm::WINDOW_TYPE_POPUP) {
     profile = reinterpret_cast<Profile*>(
         window->GetNativeWindowProperty(Profile::kProfileKey));
   }