Fix case of 'Lock screen'

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 1205 matching lines @@
         </message>
         <message name="IDS_VIEW_BACKGROUND_PAGES" desc="The text label of the View background pages menu item">
           View Background Pages (<ph name="NUM_BACKGROUND_APPS">$1<ex>3</ex></ph>)
         </message>
         <message name="IDS_EXIT" desc="In Title Case: The text label of the Exit menu item">
           E&amp;xit
         </message>
       </if>
       <if expr="pp_ifdef('chromeos')">
         <message name="IDS_LOCK_SCREEN" desc="The text label of the Lock Screen menu item">
-          Lock Screen
+          Lock screen
         </message>
         <message name="IDS_SIGN_OUT" desc="The text label of the Sign Out menu item">
           Sign out
         </message>
         <message name="IDS_EXIT_GUEST_MODE" desc="The text label of the Exit guest session menu item. Note: translations should assume that it's a Exit Guest (session). So word session may be added to translation if it's a better looking phrase.">
           Exit Guest
         </message>
       </if>
 
       <!-- Protector error messages -->
@@ skipping 13503 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>