Detect removed files and reflect the state in chrome://downloads and the download shelf

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. OS values are passed through from Python's sys.platform:
 
   win32 - Windows
   darwin - Mac
   linux2 - Linux (both Views and GTK+)
 
@@ skipping 2195 matching lines @@
           Show in folder
         </message>
       </if>
       <if expr="os == 'darwin'">
         <message name="IDS_DOWNLOAD_LINK_SHOW"
                  desc="Mac: In the download view, 'Show in Finder' link text">
           Show in Finder
         </message>
       </if>
       <message name="IDS_DOWNLOAD_TAB_CANCELED"
-               desc="Cancel link text">
+               desc="Text that appears next to downloaded files that have been canceled">
         Canceled
       </message>
+      <message name="IDS_DOWNLOAD_FILE_REMOVED"
+               desc="Text that appears next to downloaded files that have been removed">
+        Removed
+      </message>
       <message name="IDS_DOWNLOAD_TAB_PROGRESS_STATUS_TIME_UNKNOWN"
                desc="The status text for a download in progress in the download manager. This includes information such as speed and received byte counts and is used when we do not know the remaining time">
         <ph name="SPEED">$1<ex>10kB/s</ex></ph> - <ph name="RECEIVED_AMOUNT">$2<ex>40kB</ex></ph>
       </message>
       <message name="IDS_DOWNLOAD_TAB_PROGRESS_STATUS"
                desc="The status text for a download in progress in the download manager. This includes information such as speed, received byte counts as well as remaining time">
         <ph name="SPEED">$1<ex>10kB/s</ex></ph> - <ph name="RECEIVED_AMOUNT">$2<ex>40kB</ex></ph>, <ph name="TIME_REMAINING">$3<ex>42 mins left</ex></ph>
       </message>
       <message name="IDS_DOWNLOAD_TAB_PROGRESS_SIZE"
                desc="Speed and received byte counts (with total)">
@@ skipping 10163 matching lines @@
     </includes>
     <structures fallback_to_english="true">
       <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>