Merge 142492

Merge 142492
> document.write during window.onload can trigger DumpRenderTree to dump the render tree
> https://bugs.webkit.org/show_bug.cgi?id=109465
> 
> Reviewed by Eric Seidel.
> 
> Source/WebCore:
> 
> This patch is a partial revert of
> http://trac.webkit.org/changeset/142378. It's not safe to call
> checkComplete during the load event. We'll need to find another way of
> calling checkComplete at the right time.
> 
> Test: fast/parser/document-write-during-load.html
> 
> * dom/Document.cpp:
> (WebCore::Document::decrementActiveParserCount):
> 
> LayoutTests:
> 
> * fast/parser/document-write-during-load-expected.txt: Added.
> * fast/parser/document-write-during-load.html: Added.
> 

TBR=abarth@webkit.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=143056