Add chrome/browser/extensions to "GN check"

chrome/browser/extensions/api/tabs/windows_event_router.cc

Index: chrome/browser/extensions/api/tabs/windows_event_router.cc
diff --git a/chrome/browser/extensions/api/tabs/windows_event_router.cc b/chrome/browser/extensions/api/tabs/windows_event_router.cc
index 82697203cc40373309d52f4cca3cd8bdb50644b2..450bb9aa81a738fc440bc97ec8e984bc767458ad 100644
--- a/chrome/browser/extensions/api/tabs/windows_event_router.cc
+++ b/chrome/browser/extensions/api/tabs/windows_event_router.cc
@@ -159,7 +159,7 @@ WindowsEventRouter::WindowsEventRouter(Profile* profile)
 }
 
 WindowsEventRouter::~WindowsEventRouter() {
-#if !defined(OS_MACOSX)
+#if defined(TOOLKIT_VIEWS) && !defined(OS_MACOSX)
   views::WidgetFocusManager::GetInstance()->RemoveFocusChangeListener(this);
 #endif
 }
@@ -214,7 +214,7 @@ void WindowsEventRouter::OnWindowControllerRemoved(
                 window_controller, std::move(args));
 }
 
-#if !defined(OS_MACOSX)
+#if defined(TOOLKIT_VIEWS) && !defined(OS_MACOSX)
 void WindowsEventRouter::OnNativeFocusChanged(gfx::NativeView focused_now) {
   if (!focused_now)
     OnActiveWindowChanged(nullptr);