Revert of Correctly set ScriptState in the image loader microtask (patchset #1 id:1 of https://codereview.chromium.org/1153233002/)

      Reason for revert:
Tree on failure, might be causing the issues w/ leaking

https://code.google.com/p/chromium/issues/detail?id=492829&thanks=492829&ts=1432760699

Original issue's description:
> Correctly set ScriptState in the image loader microtask
> 
> BUG=487155
> R=haraken@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195981

TBR=haraken@chromium.org,jochen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=487155

Review URL: https://codereview.chromium.org/1162483002

git-svn-id: svn://svn.chromium.org/blink/trunk@196007 bbb929c8-8fbe-4397-9dbb-9b2b20218538