diff --git a/core/lib/Drupal/Core/Layout/IconGenerator.php b/core/lib/Drupal/Core/Layout/IconGenerator.php
index 621672d..be36b20 100644
--- a/core/lib/Drupal/Core/Layout/IconGenerator.php
+++ b/core/lib/Drupal/Core/Layout/IconGenerator.php
@@ -10,7 +10,32 @@ class IconGenerator implements IconGeneratorInterface {
   /**
    * {@inheritdoc}
    */
-  public function generateSvg(array $regions, $width, $height, $stroke_width, $fill, $stroke) {
+  public function generateSvgFromIconMap(array $icon_map, $width, $height, $stroke_width, $padding, $fill, $stroke) {
+    $regions = $this->calculateSvgValues($icon_map, $width, $height, $stroke_width, $padding);
+    return $this->generateSvg($regions, $width, $height, $stroke_width, $fill, $stroke);
+  }
+
+  /**
+   * Generates an SVG.
+   *
+   * @param mixed[] $regions
+   *   An array keyed by region name, with each element containing the 'height',
+   *   'width', and 'x' and 'y' offsets of each region.
+   * @param int $width
+   *   The width of the generated SVG.
+   * @param int $height
+   *   The height of the generated SVG.
+   * @param int $stroke_width
+   *   The width of region borders.
+   * @param string $fill
+   *   The fill color of regions.
+   * @param string $stroke
+   *   The color of region borders.
+   *
+   * @return array
+   *   A render array representing a SVG icon.
+   */
+  protected function generateSvg(array $regions, $width, $height, $stroke_width, $fill, $stroke) {
     $build = [
       '#type' => 'html_tag',
       '#tag' => 'svg',
@@ -54,15 +79,6 @@ public function generateSvg(array $regions, $width, $height, $stroke_width, $fil
   }
 
   /**
-   * {@inheritdoc}
-   */
-  public function generateSvgFromIconMap(array $icon_map, $width, $height, $stroke_width, $padding, $fill, $stroke) {
-    $regions = $this->calculateSvgValues($icon_map, $width, $height, $stroke_width, $padding);
-    return $this->generateSvg($regions, $width, $height, $stroke_width, $fill, $stroke);
-
-  }
-
-  /**
    * Calculates the dimensions and offsets of all regions.
    *
    * @param array $rows
diff --git a/core/lib/Drupal/Core/Layout/IconGeneratorInterface.php b/core/lib/Drupal/Core/Layout/IconGeneratorInterface.php
index 56777f9..38cd949 100644
--- a/core/lib/Drupal/Core/Layout/IconGeneratorInterface.php
+++ b/core/lib/Drupal/Core/Layout/IconGeneratorInterface.php
@@ -19,17 +19,17 @@
    *   |                              |
    *   |-------|--------------|-------|
    *   |       |              |       |
-   *   |  25%  |      50%     |  25%  |
+   *   |       |      50%     |  25%  |
    *   |       |              |       |
-   *   |-------|--------------|-------|
-   *   |                              |
-   *   |             100%             |
-   *   |                              |
+   *   |  25%  |--------------|-------|
+   *   |       |                      |
+   *   |       |         75%          |
+   *   |       |                      |
    *   |------------------------------|
    *   The corresponding array would be:
    *   - [top]
    *   - [first, second, second, third]
-   *   - [bottom].
+   *   - [first, bottom, bottom, bottom].
    * @param int $width
    *   The width of the generated SVG.
    * @param int $height
@@ -48,26 +48,4 @@
    */
   public function generateSvgFromIconMap(array $icon_map, $width, $height, $stroke_width, $padding, $fill, $stroke);
 
-  /**
-   * Generates an SVG.
-   *
-   * @param mixed[] $regions
-   *   An array keyed by region name, with each element containing the 'height',
-   *   'width', and 'x' and 'y' offsets of each region.
-   * @param int $width
-   *   The width of the generated SVG.
-   * @param int $height
-   *   The height of the generated SVG.
-   * @param int $stroke_width
-   *   The width of region borders.
-   * @param string $fill
-   *   The fill color of regions.
-   * @param string $stroke
-   *   The color of region borders.
-   *
-   * @return array
-   *   A render array representing a SVG icon.
-   */
-  public function generateSvg(array $regions, $width, $height, $stroke_width, $fill, $stroke);
-
 }