Include webkit strings in test shell data pack.

webkit/glue/webkit_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. Specifically, these are UI strings that are used by webkit that
 need to be translated for each locale.-->
 
 <!-- Some of these strings and string descriptions were taken from
 WebKit/win/WebCoreLocalizedStrings.cpp so we include the original license
 below:
 
@@ skipping 79 matching lines @@
     <output filename="webkit_strings_sr.rc" type="rc_all" lang="sr" />
     <output filename="webkit_strings_sv.rc" type="rc_all" lang="sv" />
     <output filename="webkit_strings_ta.rc" type="rc_all" lang="ta" />
     <output filename="webkit_strings_te.rc" type="rc_all" lang="te" />
     <output filename="webkit_strings_th.rc" type="rc_all" lang="th" />
     <output filename="webkit_strings_tr.rc" type="rc_all" lang="tr" />
     <output filename="webkit_strings_uk.rc" type="rc_all" lang="uk" />
     <output filename="webkit_strings_vi.rc" type="rc_all" lang="vi" />
     <output filename="webkit_strings_zh-CN.rc" type="rc_all" lang="zh-CN" />
     <output filename="webkit_strings_zh-TW.rc" type="rc_all" lang="zh-TW" />
+
+    <output filename="webkit_strings_en-US.pak" type="data_package" lang="en" />
   </outputs>
   <translations>
     <file path="resources/webkit_strings_ar.xtb" lang="ar" />
     <file path="resources/webkit_strings_bg.xtb" lang="bg" />
     <file path="resources/webkit_strings_ca.xtb" lang="ca" />
     <file path="resources/webkit_strings_cs.xtb" lang="cs" />
     <file path="resources/webkit_strings_da.xtb" lang="da" />
     <file path="resources/webkit_strings_de.xtb" lang="de" />
     <file path="resources/webkit_strings_el.xtb" lang="el" />
     <file path="resources/webkit_strings_en-GB.xtb" lang="en-GB" />
@@ skipping 173 matching lines @@
       <message name="IDS_DEFAULT_PLUGIN_DOWNLOAD_FAILED_MSG" desc="Message displayed by the default plugin when download is failed.">
         Failed to install plugin from <ph name="URL">$1<ex>http://www.google.com/blablah.exe</ex></ph>
       </message>
 
       <message name="IDS_DEFAULT_PLUGIN_INSTALLATION_FAILED_MSG" desc="Message displayed by the default plugin when installation is failed.">
         Plugin installation failed
       </message>
     </messages>
   </release>
 </grit>