Minor change to scary download UI text for extension install.

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 1982 matching lines @@
                desc="Button close text.">
         Cancel
       </message>
 
       <message name="IDS_PROMPT_DANGEROUS_DOWNLOAD"
                desc="Message shown to the user to validate the download of a dangerous file.">
         This type of file can harm your computer. Are you sure you want to download <ph name="FILE_NAME">$1<ex>malware.exe</ex></ph>?
       </message>
       <message name="IDS_PROMPT_DANGEROUS_DOWNLOAD_EXTENSION"
          desc="Message shown to the user to validate the download of an extension file.">
-        Extensions can harm your computer. Are you sure you want to continue?
+        Extensions and themes can harm your computer. Are you sure you want to continue?
       </message>
       <message name="IDS_SAVE_DOWNLOAD"
                desc="Text for the button used to validate the downloading of a dangerous download.">
         Save
       </message>
       <message name="IDS_CONTINUE_EXTENSION_DOWNLOAD"
                desc="Text for the button used to validate the installation of an extension.">
         Continue
       </message>
       <message name="IDS_DISCARD_DOWNLOAD"
@@ skipping 3812 matching lines @@
       <message name="IDS_STATUSBAR_BATTERY_IS_CHARGED" desc="In the power menu button, the battery is charged message.">
         Battery is charged
       </message>
       <message name="IDS_COMPACT_NAVBAR" desc="The menu item on the app menu to toggle compact navigation bar">
         Toggle Compact Navigation Bar
       </message>
     </if>
     </messages>
   </release>
 </grit>