refactor: remove expensive no-op call to _get-token-slots (#31138)

Co-authored-by: Andrew Seguin <[email protected]>

Author: andrewseguin

src/material/core/tokens/_m3-tokens.scss

@@ -1,35 +1,7 @@
-@use '../m2' as m2-theming;
 @use '../style/sass-utils';
-@use './m2-tokens';
 @use './m3';
 @use 'sass:map';
 
-$_cached-token-slots: null;
-
-/// Determines the token slots for all components.
-@function _get-token-slots() {
-  // Cache the slots since they're constant and calculating
-  // them appears to be expensive (see #29009).
-  @if ($_cached-token-slots) {
-    @return $_cached-token-slots;
-  }
-
-  // TODO(mmalerba): Refactor this to not depend on the legacy theme when moving out of
-  //  material-experimental. This is a hack for now because there is no good way to get the token
-  //  slots in material-experimental without exposing them all from material.
-  $fake-theme: m2-theming.define-light-theme((
-    color: (
-      primary: m2-theming.define-palette(m2-theming.$red-palette),
-      accent: m2-theming.define-palette(m2-theming.$red-palette),
-      warn: m2-theming.define-palette(m2-theming.$red-palette),
-    ),
-    typography: m2-theming.define-typography-config(),
-    density: 0
-  ));
-  $_cached-token-slots: m2-tokens.m2-tokens-from-theme($fake-theme) !global;
-  @return $_cached-token-slots;
-}
-
 /// Generates a set of namespaced tokens for all components.
 /// @param {Map} $systems The MDC system tokens
 /// @param {Boolean} $include-non-systemized Whether to include non-systemized tokens
@@ -46,8 +18,6 @@ $_cached-token-slots: null;
   ), $systems);
   $exclude-hardcoded: not $include-non-systemized;
 
-  $token-slots: _get-token-slots();
-
   // TODO(mmalerba): Fill in remaining tokens.
   $result: sass-utils.deep-merge-all(
     // Add the system color & typography tokens (so we can give users access via an API).