refactor: replace USE_X11 with OS_LINUX for sharing code with Ozone (#25522)

shell/browser/ui/inspectable_web_contents_view_delegate.h

@@ -23,7 +23,7 @@ class InspectableWebContentsViewDelegate {
   // Returns the icon of devtools window.
   virtual gfx::ImageSkia GetDevToolsWindowIcon();
 
-#if defined(USE_X11)
+#if defined(OS_LINUX)
   // Called when creating devtools window.
   virtual void GetDevToolsWindowWMClass(std::string* name,
                                         std::string* class_name) {}