MD Bookmarks: Always use a two-way arrow cursor for resizing the sidebar

chrome/browser/resources/md_bookmarks/app.html

Index: chrome/browser/resources/md_bookmarks/app.html
diff --git a/chrome/browser/resources/md_bookmarks/app.html b/chrome/browser/resources/md_bookmarks/app.html
index 7d01735cb29ed412b44fb544fbdf222283fe8d5c..577ede515fbbf3c57a8db62416479e80b08859b5 100644
--- a/chrome/browser/resources/md_bookmarks/app.html
+++ b/chrome/browser/resources/md_bookmarks/app.html
@@ -34,7 +34,11 @@
 
       #splitter {
         box-sizing: border-box;
+        cursor: col-resize;
+<if expr="is_win">
+        /* Unlike other platforms, e-resize is a two-way arrow on Windows. */
         cursor: e-resize;
+</if>
         flex: 0 0 var(--splitter-width);
         opacity: 0;
       }
@@ -46,10 +50,6 @@
         transition: opacity 100ms ease-out;
       }
 
-      :host-context([dir='rtl']) #splitter {
-        cursor: w-resize;
-      }
-
       #sidebar {
         -webkit-padding-start: 3px;
         display: block;