fix(material-experimental): rename theme files to match stable components

Author: andrewseguin

src/dev-app/theme.scss

@@ -1,5 +1,5 @@
 @import '../material/core/theming/all-theme';
-@import '../material-experimental/mdc-slider/mdc-slider';
+@import '../material-experimental/mdc-slider/slider-theme';
 @import '../material-experimental/mdc-theming/all-theme';
 @import '../material-experimental/mdc-typography/all-typography';
 @import '../material-experimental/popover-edit/popover-edit';

src/material-experimental/mdc-autocomplete/_mdc-autocomplete.scss renamed to src/material-experimental/mdc-autocomplete/_autocomplete-theme.scss

@@ -33,7 +33,7 @@ ng_module(
 sass_library(
     name = "mdc_form_field_scss_lib",
     srcs = [
-        "_mdc-form-field.scss",
+        "_form-field-theme.scss",
         "_mdc-text-field-theme-variable-refresh.scss",
     ],
     deps = [