MD Settings: Fix size and padding of expand button

chrome/browser/resources/settings/settings_vars_css.html

Index: chrome/browser/resources/settings/settings_vars_css.html
diff --git a/chrome/browser/resources/settings/settings_vars_css.html b/chrome/browser/resources/settings/settings_vars_css.html
index 9bbc6a829321ca2d9a689a4ef6354cbc82a2c433..b3cbbf96bc7cba97897863bf571b635c4863e448 100644
--- a/chrome/browser/resources/settings/settings_vars_css.html
+++ b/chrome/browser/resources/settings/settings_vars_css.html
@@ -20,10 +20,6 @@
     --settings-disabled-opacity: .65;
     --settings-error-color: var(--paper-red-700);
 
-    /* The inner icon is 20px in size. paper-icon-button has 8px padding. */
-    --settings-icon-ripple-size: 36px;
-    --settings-icon-size: 20px;
-
     --settings-list-frame-padding: {
       -webkit-padding-end: var(--settings-box-row-padding);
       -webkit-padding-start: calc(
@@ -73,13 +69,13 @@
     --checkbox-size: 16px;
     --checkbox-spacing: 18px;
     --iron-icon-fill-color: var(--paper-grey-600);
-    --iron-icon-height: var(--settings-icon-size);
-    --iron-icon-width: var(--settings-icon-size);
+    --iron-icon-height: var(--cr-icon-size);
+    --iron-icon-width: var(--cr-icon-size);
     --paper-checkbox-label-color: inherit;
     --paper-dialog-color: inherit;
     --paper-icon-button: {
-      height: var(--settings-icon-ripple-size);
-      width: var(--settings-icon-ripple-size);
+      height: var(--cr-icon-ripple-size);
+      width: var(--cr-icon-ripple-size);
     };
     --paper-input-container-focus-color: var(--google-blue-500);
     --paper-input-container-input: {