Revert "fix(material/checkbox): incorrect text color when placed insi…

…de an overlay with a dark theme (angular#19054)" (angular#24519)

This reverts commit f20122a.

src/material/checkbox/_checkbox-theme.scss

@@ -32,12 +32,6 @@
     fill: $checkbox-mark-color;
   }
 
-  .mat-checkbox-label {
-    // Explicitly set the text color since the checkbox may be
-    // inside an overlay that doesn't have the proper theme text color.
-    color: theming.get-color-from-palette($foreground, 'text');
-  }
-
   .mat-checkbox-checkmark-path {
     // !important is needed here because a stroke must be set as an
     // attribute on the SVG in order for line animation to work properly.