Changed the label for image screen according to mocks.

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. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 3351 matching lines @@
         Choose a password:
       </message>
       <message name="IDS_ACCOUNT_CREATION_REENTER_PASSWORD" desc="The label of the second password field in the account creation dialog">
         Re-enter password:
       </message>
       <message name="IDS_ACCOUNT_CREATION_BUTTON" desc="The label of the 'Create Account' button on the account creation dialog">
         Create Account
       </message>
       <!-- User Image Selection Dialog -->
       <message name="IDS_USER_IMAGE_SCREEN_TITLE" desc="String to be displayed in the title bar of the user image selection dialog">
-        Take a photo to identify your account at sign-in. You may change your photo later in Preferences.
+        Smile! Take a picture of yourself and set it as your account picture. You can change the picture later in Settings.
       </message>
       <message name="IDS_USER_IMAGE_NO_VIDEO" desc="Error text to be displayed on user image if camera fails to initialize">
         The camera failed to initialize. Please, try setting your photo later in Preferences.
       </message>
       <!-- OOBE progress bar labels -->
       <message name="IDS_OOBE_SELECT_NETWORK" desc="The label of OOBE progress bar step, must be short">
         Select network
       </message>
       <message name="IDS_OOBE_EULA" desc="The label of OOBE progress bar step, must be short">
         Accept agreement
@@ skipping 7647 matching lines @@
 
     </messages>
 
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>