[MD WebUI] Move icons used in Bookmarks and Settings to shared file.

chrome/browser/resources/settings/settings_shared_css.html

Index: chrome/browser/resources/settings/settings_shared_css.html
diff --git a/chrome/browser/resources/settings/settings_shared_css.html b/chrome/browser/resources/settings/settings_shared_css.html
index 8b4b3825d6db6c3653c0bcacd616e95f4d541224..6f55b8e2bdbea187bc5e941bdac63f4362036073 100644
--- a/chrome/browser/resources/settings/settings_shared_css.html
+++ b/chrome/browser/resources/settings/settings_shared_css.html
@@ -15,7 +15,7 @@
         transform: scaleX(-1);  /* Flip on the X axis (aka mirror). */
       }
 
-      :host-context([dir=rtl]) paper-icon-button[icon='settings:arrow-back'] {
+      :host-context([dir=rtl]) paper-icon-button[icon='cr:arrow-back'] {
         transform: scaleX(-1);  /* Flip on the X axis (aka mirror). */
       }
 
@@ -33,7 +33,7 @@
       }
 
       iron-icon[icon='cr:check'],
-      iron-icon[icon='settings:done'] {
+      iron-icon[icon='cr:done'] {
        --iron-icon-fill-color: var(--google-green-500);
       }