refactor: remove unused typography function (#31355)

Co-authored-by: Andrew Seguin <andrewseguin@google.com>

Author: andrewseguin

src/material/core/theming/_inspection.scss

@@ -279,15 +279,3 @@ $_typography-properties: (font, font-family, line-height, font-size, letter-spac
  @return $theme;
  }
 }
-
-/// Gets a version of the theme with a modified typography config that preserves old behavior in
-/// some components that previously used `private-typography-to-2014-config`.
-/// Do not introduce new usages of this, it should be cleaned up and removed.
-/// @deprecated
-@function private-get-typography-back-compat-theme($theme) {
- @return if(
- get-theme-version($theme) == 0,
- m2-inspection.private-get-typography-back-compat-theme($theme),
- $theme
- );
-}

src/material/core/theming/_m2-inspection.scss

@@ -235,36 +235,3 @@ $_typography-properties: (font, font-family, line-height, font-size, letter-spac
  }
  @return $theme;
 }
-
-/// Gets a version of the theme with a modified typography config that preserves old behavior in
-/// some components that previously used `private-typography-to-2014-config`.
-/// Do not introduce new usages of this, it should be cleaned up and removed.
-/// @deprecated
-@function private-get-typography-back-compat-theme($theme) {
- // It is possible for a user to pass a "density theme" that is just a number.
- @if meta.type-of($theme) != 'map' {
- @return $theme;
- }
- $internal: map.get($theme, $_internals, m2-config);
- $theme: map.remove($theme, $_internals);
- @if theme-has($theme, typography) {
- $typography-config: m2-theming.get-typography-config($theme);
- // gmat configs have both 2018 and 2014 keys.
- @if (not typography-versioning.private-typography-is-2014-config($typography-config)) or
- (not typography-versioning.private-typography-is-2018-config($typography-config)) {
- @return $theme;
- }
- $new-typography-config: typography-versioning.private-typography-to-2018-config(
- $typography-config, true);
- // subtitle-2 is mapped differently by `private-typography-to-2014-config`.
- $new-typography-config: map.set(
- $new-typography-config, subtitle-2, map.get($new-typography-config, body-1));
- $theme: if($theme == $typography-config, $new-typography-config,
- map.set($theme, typography, $new-typography-config));
- }
- @if $internal {
- $internal: private-get-typography-back-compat-theme($internal);
- $theme: map.set($theme, $_internals, m2-config, $internal);
- }
- @return $theme;
-}