Switch theme loading to use its own string....

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 5739 matching lines @@
 
     <!-- ProcessSingleton -->
     <message name="IDS_PROFILE_IN_USE_LINUX" desc="Message shown when the browser cannot start because the profile is in use on a different host.">
       The profile appears to be in use by process <ph name="PROCESS_ID">$1<ex>12345</ex></ph> on host <ph name="HOST_NAME">$2<ex>example.com</ex></ph>.  If you are sure no other processes are using this profile, delete the file <ph name="LOCK_FILE">$3<ex>/home/user/.config/google-chrome/SingletonLock</ex></ph> and restart <ph name="PRODUCT_NAME">$4<ex>Google Chrome</ex></ph>.
     </message>
 
     <message translateable="false" name="IDS_GLEN" desc="Glen">
       Glen
     </message>
 
+    <!-- Theme UI -->
+    <message name="IDS_THEME_LOADING_TITLE" desc="The text to be displayed in a window while a theme is loading.">
+      Loading...
+    </message>
+
     <!-- Extra Mac UI Strings -->
     <if expr="os == 'darwin'">
       <message name="IDS_PLEASE_RESTART_BROWSER" desc="Title of the alert when Chrome needs to be restart for a change/update to take effect.">
         Please Restart <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>
       </message>
       <message name="IDS_SAVE_PAGE_FILE_FORMAT_PROMPT_MAC" desc="The title of the File Format label for saving a page.">
         Format:
       </message>
     </if>
 
@@ skipping 56 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>