[MD Bookmarks] Make folder nodes extend their whole width.

chrome/browser/resources/md_bookmarks/folder_node.html

Index: chrome/browser/resources/md_bookmarks/folder_node.html
diff --git a/chrome/browser/resources/md_bookmarks/folder_node.html b/chrome/browser/resources/md_bookmarks/folder_node.html
index 061536de2faa46c96c6b2b01ab34875afdabfd24..b5979a9c4195f04aabe04a33b2bca355ddd6c2f4 100644
--- a/chrome/browser/resources/md_bookmarks/folder_node.html
+++ b/chrome/browser/resources/md_bookmarks/folder_node.html
@@ -12,6 +12,7 @@
   <template>
     <style include="shared-style">
       :host {
+        --padding-left-per-depth: 30px;
         display: block;
       }
 
@@ -34,10 +35,6 @@
         height: 40px;
       }
 
-      #descendants {
-        -webkit-padding-start: 40.5px;
-      }
-
       #folder-label {
         color: var(--secondary-text-color);
         cursor: pointer;
@@ -78,7 +75,7 @@
     <div id="descendants" hidden$="[[isClosed]]">
       <template is="dom-repeat" items="[[item.children]]"
           filter="isFolder_" as="child">
-        <bookmarks-folder-node item-id="[[child]]">
+        <bookmarks-folder-node item-id="[[child]]" depth="[[getChildDepth_(depth)]]">
         </bookmarks-folder-node>
       </template>
     </div>