[filebrowser] Support renaming in Gallery.

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 9816 matching lines @@
       </message>
       <message name="IDS_FILE_BROWSER_GALLERY_ROTATE_RIGHT" desc="In the Gallery, the title on the button that rotates the photo 90 degrees to the right (clockwise).">
         Right
       </message>
       <message name="IDS_FILE_BROWSER_GALLERY_UNDO" desc="In the Gallery, the text on the button that reverts the most recent operation.">
         Undo
       </message>
       <message name="IDS_FILE_BROWSER_GALLERY_REDO" desc="In the Gallery, the text on the button that performs again the operation that has been recently reverted.">
         Redo
       </message>
+      <message name="IDS_FILE_BROWSER_GALLERY_FILE_EXISTS" desc="In the Gallery, the message informing that file already exists when attempting to rename.">
+        File already exists
+      </message>
 
       <message name="IDS_FILE_BROWSER_CONFIRM_OVERWRITE_FILE" desc="Asks the user if they are sure they want to overwrite an existing file with another one.">
         A file named "$1" already exists. Do you want to replace it?
       </message>
       <message name="IDS_FILE_BROWSER_FILE_ALREADY_EXISTS" desc="Error message displayed when user tries to create a file with an existing name.">
         The file named "$1" already exists. Please choose a different name.
       </message>
       <message name="IDS_FILE_BROWSER_DIRECTORY_ALREADY_EXISTS" desc="Error message displayed when user tries to create a directory with an existing name.">
         The directory named "$1" already exists. Please choose a different name.
       </message>
@@ skipping 4828 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>