[MD Bookmarks] Remove the bookmarks-sidebar element.

chrome/browser/resources/md_bookmarks/app.js

Index: chrome/browser/resources/md_bookmarks/app.js
diff --git a/chrome/browser/resources/md_bookmarks/app.js b/chrome/browser/resources/md_bookmarks/app.js
index ed59f5e4024dd59f92311b4abbaa0e0092f2b278..a9723f10fae31797f346ba62140e921992fa2f1b 100644
--- a/chrome/browser/resources/md_bookmarks/app.js
+++ b/chrome/browser/resources/md_bookmarks/app.js
@@ -86,7 +86,8 @@ Polymer({
       splitterTarget.style.width =
           window.localStorage[LOCAL_STORAGE_TREE_WIDTH_KEY];
     }
-    this.sidebarWidth_ = splitterTarget.getComputedStyleValue('width');
+    this.sidebarWidth_ =
+        /** @type {string} */ (getComputedStyle(splitterTarget).width);
 
     splitter.addEventListener('resize', function(e) {
       window.localStorage[LOCAL_STORAGE_TREE_WIDTH_KEY] =
@@ -100,7 +101,8 @@ Polymer({
 
   /** @private */
   updateSidebarWidth_: function() {
-    this.sidebarWidth_ = this.$.sidebar.getComputedStyleValue('width');
+    this.sidebarWidth_ =
+        /** @type {string} */ (getComputedStyle(this.$.sidebar).width);
   },
 
   /** @private */