Send <iframe srcdoc> to the threaded parser

Source/core/html/parser/HTMLParserOptions.cpp

Index: Source/core/html/parser/HTMLParserOptions.cpp
diff --git a/Source/core/html/parser/HTMLParserOptions.cpp b/Source/core/html/parser/HTMLParserOptions.cpp
index 717a1d89e1de8f62f7d6a348899a084d4a699910..6ff1f1196619a5913b9caa1189553d6369473e7b 100644
--- a/Source/core/html/parser/HTMLParserOptions.cpp
+++ b/Source/core/html/parser/HTMLParserOptions.cpp
@@ -45,8 +45,7 @@ HTMLParserOptions::HTMLParserOptions(Document* document)
     // with historical synchronous loading/parsing behavior.
     // FIXME: Gecko does not load javascript: urls synchronously, why do we?
     // See LayoutTests/loader/iframe-sync-loads.html
-    // FIXME: Use isAboutBlankURL() instead of protocolIsAbout() to not include about:srcdoc.
-    useThreading = settings && settings->threadedHTMLParser() && !document->url().protocolIsAbout();
+    useThreading = settings && settings->threadedHTMLParser() && !document->url().isAboutBlankURL();

[abarth-chromium, 2014/04/23 21:49:20]

We should drop this setting too.

 }
 
 }