Bug 848527: Add CORS header for collusion demo json file.

media/.htaccess

@@ -35,6 +35,12 @@ ExpiresByType application/octet-stream "access plus 0 seconds"
     ExpiresByType text/css "access plus 12 hours"
 </Files>
 
+# bug 848527
+<Files trackers.json>
+    Header set Access-Control-Allow-Origin "*"
+    ExpiresByType application/json "access plus 1 year"
+</Files>
+
 FileETag MTime
 
 <FilesMatch "\.txt$">