Revert of Replace homebrew scrollbar in Files app with that of Blink.

ui/file_manager/file_manager/foreground/js/ui/file_table.js

Index: ui/file_manager/file_manager/foreground/js/ui/file_table.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/file_table.js b/ui/file_manager/file_manager/foreground/js/ui/file_table.js
index d2f85f1e12261655f29f90b5285639d7c0a839a4..e5ef7831f4ab15f28d35085d8f6bee2c5e819445 100644
--- a/ui/file_manager/file_manager/foreground/js/ui/file_table.js
+++ b/ui/file_manager/file_manager/foreground/js/ui/file_table.js
@@ -433,6 +433,9 @@ FileTable.decorate = function(
   self.setRenderFunction(self.renderTableRow_.bind(self,
       self.getRenderFunction()));
 
+  self.scrollBar_ = new ScrollBar();
+  self.scrollBar_.initialize(self, self.list);
+
   // Keep focus on the file list when clicking on the header.
   self.header.addEventListener('mousedown', function(e) {
     self.list.focus();