feat(theming): Classic theme by default

patches/classic-theme-by-default.patch

@@ -0,0 +1,24 @@
+Copyright 2024-2025 The Trivalent Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is
+distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and limitations under the License.
+---
+diff --git a/ui/linux/linux_ui_factory.cc b/ui/linux/linux_ui_factory.cc
+index 9307de3ae9..fd00c5c5f7 100644
+--- a/ui/linux/linux_ui_factory.cc
++++ b/ui/linux/linux_ui_factory.cc
+@@ -194,6 +194,7 @@ GetLinuxUiThemes() {
+ }
+
+ SystemTheme GetDefaultSystemTheme() {
++  return SystemTheme::kDefault;
+   std::unique_ptr<base::Environment> env = base::Environment::Create();
+
+   switch (base::nix::GetDesktopEnvironment(env.get())) {