[filebrowser] Add left panel with roots.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 9687 matching lines @@
         Allow
       </message>
       <message name="IDS_MULTI_DOWNLOAD_WARNING_DENY" desc="Text on the deny button in the IDS_MULTI_DOWNLOAD_WARNING dialog">
         Deny
       </message>
 
       <!-- File Browser -->
       <message name="IDS_FILE_BROWSER_ROOT_DIRECTORY_LABEL" desc="Root directory label.">
         Files
       </message>
-      <message name="IDS_FILE_BROWSER_DOWNLOADS_DIRECTORY_LABEL" desc="/Downloads directory label.">
-        File Shelf
-      </message>
       <message name="IDS_FILE_BROWSER_ARCHIVE_DIRECTORY_LABEL" desc="/archive directory label.">
         Archives
       </message>
       <message name="IDS_FILE_BROWSER_REMOVABLE_DIRECTORY_LABEL" desc="/removable directory label.">
         External Storage
       </message>
       <message name="IDS_FILE_BROWSER_MEDIA_DIRECTORY_LABEL" desc="/media directory label.">
         External Storage
       </message>
       <message name="IDS_FILE_BROWSER_CHROMEBOOK_DIRECTORY_LABEL" desc="Chromebook local directory label.">
@@ skipping 5012 matching lines @@
     </messages>
     <structures fallback_to_english="true">
       <!-- Make sure these stay in sync with the structures in generated_resources.grd. -->
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
   </release>
 </grit>