Verify signed .crx extension installations

chrome/test/data/extensions/content_script_inject/manifest.json

 {
-  "id": "00123456789ABCDEF0123456789ABCDEF0123456",
   "version": "1.0.0.0",
   "name": "User script inject",
   "content_scripts": [
     {
       "matches": ["file://*/content_script_inject_page.html"],
       "css": ["script1.css"],
       "js": ["js_test.js", "script1a.js", "script1b.js"]
     },
     {
       "matches": ["file://*/content_script_inject_page.html"],
       "js": ["js_test.js", "script2.js"]
     },
     {
       "matches": ["file://*/content_script_inject_page.html"],
       "js": ["js_test.js", "script3.js"],
       "run_at": "document_start"  
     }
   ]
 }