Add delete context menu for custom wallpapers and some ui tweaks

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="pp_ifdef('chromeos')">. -->
 <grit-part>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
   <message name="IDS_IDLE_LOGOUT_WARNING_RESTART" desc="Restart label for the idle logout dialog. Used in retail mode only..">
     This computer will reset in <ph name="LOGOUT_TIME_LEFT">$1<ex>20</ex></ph> seconds.
@@ skipping 928 matching lines @@
   </message>
   <message name="IDS_OPTIONS_PERSONAL_ACCOUNT_GROUP_NAME" desc="In sentence case: In the Personal Stuff settings tab, the title text for Account section.">
     Account
   </message>
   <message name="IDS_OPTIONS_ENABLE_SCREENLOCKER_CHECKBOX" desc="In the Personal Stuff settings tab, the text on the checkbox to enable screenlocker for current user.">
     Require password to wake from sleep
   </message>
   <message name="IDS_SET_WALLPAPER_BUTTON" desc="The button to set wallpaper.">
     Set wallpaper...
   </message>
-  <message name="IDS_OPTIONS_SET_WALLPAPER_DIALOG_TITLE" desc="Title of the dialog shown when user wants to change his/her wallpaper.">
-    Set Wallpaper
-  </message>
-  <message name="IDS_OPTIONS_SET_WALLPAPER_DIALOG_TEXT" desc="Text with description of what to do on Change Wallpaper dialog.">
-    Choose a picture to display on your background.
-  </message>
   <message name="IDS_OPTIONS_SET_WALLPAPER_AUTHOR_TEXT" desc="Author label.">
     Photo by
   </message>
-  <message name="IDS_OPTIONS_SET_WALLPAPER_DAILY" desc="Label for option to change wallpaper daily.">
-    Change wallpaper daily
-  </message>
   <message name="IDS_OPTIONS_WALLPAPER_CENTER_LAYOUT" desc="Label for option to center a customized wallpaper.">
     Center
   </message>
   <message name="IDS_OPTIONS_WALLPAPER_CENTER_CROPPED_LAYOUT" desc="Label for option to center crop a customized wallpaper.">
     Center Cropped
   </message>
   <message name="IDS_OPTIONS_WALLPAPER_STRETCH_LAYOUT" desc="Label for option to stretch a customized wallpaper.">
     Stretch
   </message>
-  <message name="IDS_OPTIONS_CUSTOME_WALLPAPER" desc="Label for option to choose a customized wallpaper.">
-    Browse...
-  </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE" desc="In the settings tab, the text on the button to change picture for the current user.">
     Change picture...
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE_CAPTION" desc="Caption on the user picture that user must click to change it, must be short.">
     Change
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE_DIALOG_TITLE" desc="Title of the dialog shown when user wants to change his/her picture.">
     Change picture
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE_DIALOG_TEXT" desc="Text with description of what to do on Change picture dialog.">
@@ skipping 2590 matching lines @@
   <message name="IDS_KIOSK_APP_ERROR_UNABLE_TO_MOUNT" desc="Error message used when a kiosk app fails to launch due to cryptohome error.">
     Kryptonite! The cryptohome for the kiosk application could not be mounted.
   </message>
   <message name="IDS_KIOSK_APP_ERROR_UNABLE_TO_INSTALL" desc="Error message used when a kiosk app fails to launch due to install failure.">
     Kiosk application could not be installed.
   </message>
   <message name="IDS_KIOSK_APP_ERROR_USER_CANCEL" desc="Error message used when a kiosk app launch is canceled by user.">
     Kiosk application launch canceled.
   </message>
 </grit-part>