fixup! refactor(material/progress-bar): change mat-progress-bar to use MDC's token API

Author: wagnermaciel

src/material/progress-bar/progress-bar.scss

@@ -1,3 +1,4 @@
+@use 'sass:map';
 @use '@material/theme/custom-properties' as mdc-custom-properties;
 @use '@material/linear-progress/linear-progress' as mdc-linear-progress;
 @use '@material/linear-progress/linear-progress-theme' as mdc-linear-progress-theme;
@@ -10,7 +11,12 @@
   @include mdc-linear-progress.static-styles();
 
   // Add the official slots for the MDC progress-bar.
-  @include mdc-linear-progress-theme.theme-styles($mdc-progress-bar-token-slots);
+  @include mdc-linear-progress-theme.theme-styles(
+      map.merge($mdc-progress-bar-token-slots, (
+      // Excluded because it is meant to be set by theme (b/273562256).
+      track-color: null,
+    ))
+  );
 
   // Add default values for tokens that aren't outputted by the theming API.
   .mat-mdc-progress-bar {