fix(button): strong is iOS-only

Author: manucorporat

src/components/button/button.md.scss

@@ -424,11 +424,3 @@ $button-md-round-border-radius:                 $button-round-border-radius !def
   @include md-button-outline($color-name, $color-base, $color-contrast);
   @include md-button-clear($color-name, $color-base, $color-contrast);
 }
-
-
-// MD strong Button
-// --------------------------------------------------
-
-.button-strong-md {
-  font-weight: bold;
-}

src/components/button/button.wp.scss

@@ -315,11 +315,3 @@ $button-wp-round-border-radius:                           $button-round-border-r
   @include wp-button-outline($color-name, $color-base, $color-contrast);
   @include wp-button-clear($color-name, $color-base, $color-contrast);
 }
-
-
-// WP strong Button
-// --------------------------------------------------
-
-.button-strong-wp {
-  font-weight: bold;
-}

src/components/toolbar/toolbar.md.scss

@@ -390,11 +390,3 @@ $navbar-md-height:                       $toolbar-md-height !default;
   @include md-bar-button-outline($color-name, $color-base, $color-contrast);
   @include md-bar-button-solid($color-name, $color-base, $color-contrast);
 }
-
-
-// MD strong Button
-// --------------------------------------------------
-
-.bar-button-strong-md {
-  font-weight: bold;
-}

src/components/toolbar/toolbar.wp.scss

@@ -344,11 +344,3 @@ $navbar-wp-height:                       $toolbar-wp-height !default;
   @include wp-bar-button-outline($color-name, $color-base, $color-contrast);
   @include wp-bar-button-solid($color-name, $color-base, $color-contrast);
 }
-
-
-// WP strong Button
-// --------------------------------------------------
-
-.bar-button-strong-wp {
-  font-weight: bold;
-}