Guard ash::AppType use in BrowserNonClientBrowserFrameViewAsh

EXO tags the associated wayland/ShellSurface as being of
AppType::LACROS.

  void SetLacrosAppType(aura::Window* window) {
    window->SetProperty(aura::client::kAppType,
                        static_cast<int>(ash::AppType::LACROS));
  }

BUG=1113900
R=jamescook@chromium.org

Change-Id: Id83fb6d851009068b0e080515d27c1a5c9d3038e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533334
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826535}

chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc

@@ -6,12 +6,12 @@
 
 #include <algorithm>
 
-#include "ash/public/cpp/app_types.h"
 #include "ash/public/cpp/window_properties.h"
 #include "ash/wm/window_util.h"
 #include "base/metrics/user_metrics.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
+#include "build/chromeos_buildflags.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/themes/theme_properties.h"
@@ -65,6 +65,10 @@
 #include "chrome/browser/ui/views/frame/webui_tab_strip_container_view.h"
 #endif  // BUILDFLAG(ENABLE_WEBUI_TAB_STRIP)
 
+#if BUILDFLAG(IS_CHROMEOS_ASH)
+#include "ash/public/cpp/app_types.h"
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
+
 namespace {
 
 // Color for the window title text.
@@ -123,10 +127,14 @@ void BrowserNonClientFrameViewAsh::Init() {
   UpdateProfileIcons();
 
   aura::Window* window = frame()->GetNativeWindow();
+#if BUILDFLAG(IS_CHROMEOS_ASH)
+  // This is only needed for ash. For lacros, Exo tags the associated
+  // ShellSurface as being of AppType::LACROS.
   window->SetProperty(
       aura::client::kAppType,
       static_cast<int>(browser->deprecated_is_app() ? ash::AppType::CHROME_APP
                                                     : ash::AppType::BROWSER));
+#endif
 
   window_observer_.Add(GetFrameWindow());