fix: pass frame_->IsMaximized() to GetWindowFrameProvider

This ensures that the toolkit renders the window decorations in maximized mode
while the window is maximized to ensure that there id no empty space aroung the window.

shell/browser/ui/views/client_frame_view_linux.cc

@@ -131,7 +131,7 @@ void ClientFrameViewLinux::Init(NativeWindowViews* window,
   host_supports_client_frame_shadow_ = tree_host->SupportsClientFrameShadow();
 
   frame_provider_ = ui::LinuxUi::instance()->GetWindowFrameProvider(
-      !host_supports_client_frame_shadow_);
+      !host_supports_client_frame_shadow_, frame_->IsMaximized());
 
   UpdateWindowTitle();
 
@@ -274,6 +274,9 @@ void ClientFrameViewLinux::Layout() {
     return;
   }
 
+  frame_provider_ = ui::LinuxUi::instance()->GetWindowFrameProvider(
+      !host_supports_client_frame_shadow_, frame_->IsMaximized());
+
   UpdateButtonImages();
   LayoutButtons();