Fix issue with comments and thumbnails not loading on YouTube in Safari

safari/include.youtube.js

Index: safari/include.youtube.js
===================================================================
--- a/safari/include.youtube.js
+++ b/safari/include.youtube.js
@@ -67,7 +67,12 @@
     // player with JavaScript which video and which ads to show next,
     // bypassing our flashvars rewrite code. So we disable
     // history.pushState on pages with YouTube's flash player.
-    document.location.href = "javascript:void(history.pushState = undefined);";
+    var script = document.createElement("script");
+    script.type = "application/javascript";
+    script.id = "__disablePushState";
+    script.textContent = "history.pushState = undefined;" +
+                         "document.documentElement.removeChild(document.getElementById('__disablePushState'));";

[Sebastian Noack, 2014/02/28 21:54:22]

In the previous review Wladimir suggested that we should remove the script tag
from the DOM when it's not needed anymore:
http://codereview.adblockplus.org/4663448277352448/diff/5741031244955648/safa...

But Safari neither supports the onafterscriptexecuted event nor
window.currentScript. So the only way is to give the tag an ID. A randomized ID
might be preferable, but considering  that this is only on YouTube and that the
script tag is removed immediately, I preferred a hard-coded ID in favor of less
code.

[Wladimir Palant, 2014/03/03 07:21:13]

Why have the script remove itself? Using |script.async = false| instead and
removing the tag immediately after inserting it should work as well.

[Sebastian Noack, 2014/03/05 11:24:01]

Done.

+    document.documentElement.appendChild(script);
   }
 
   var deferred = [];