Revert 23416, 23419, 23445 except for wp_reset_vars() changes. We are going a different direction with the slashing cleanup, so resetting to a clean slate. see #21767

git-svn-id: https://develop.svn.wordpress.org/trunk@23554 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/class-wp-customize-setting.php

@@ -144,7 +144,7 @@ class WP_Customize_Setting {
 	 * @return mixed Null if an input isn't valid, otherwise the sanitized value.
 	 */
 	public function sanitize( $value ) {
-		$value = wp_unslash( $value );
+		$value = stripslashes_deep( $value );
 		return apply_filters( "customize_sanitize_{$this->id}", $value, $this );
 	}