chore: remove unused method ElectronDesktopWindowTreeHostLinux::UpdateClientDecorationHints() (#43283)

Xref: dff980c9c2

Removed in #41868

shell/browser/ui/electron_desktop_window_tree_host_linux.cc

@@ -253,8 +253,4 @@ void ElectronDesktopWindowTreeHostLinux::UpdateFrameHints() {
     SizeConstraintsChanged();
   }
 }
-
-void ElectronDesktopWindowTreeHostLinux::UpdateClientDecorationHints(
-    ClientFrameViewLinux* view) {}
-
 }  // namespace electron

shell/browser/ui/electron_desktop_window_tree_host_linux.h

@@ -62,7 +62,6 @@ class ElectronDesktopWindowTreeHostLinux
   void UpdateFrameHints() override;
 
  private:
-  void UpdateClientDecorationHints(ClientFrameViewLinux* view);
   void UpdateWindowState(ui::PlatformWindowState new_state);
 
   raw_ptr<NativeWindowViews> native_window_view_;  // weak ref