Revert of Timeline: fix URLs and owner elements for image decodes of background/border images (patchset #2 id:20001 of https://codereview.chromium.org/755633002/)

Reason for revert:
Speculative revert to see whether this really could be a reson for https://code.google.com/p/chromium/issues/detail?id=437496

Original issue's description:
> Timeline: fix URLs and owner elements for image decodes of background/border images
> 
> We rely on PaintImage events to provide context information available
> on the rendering level (image URLs and owning node id) for nested
> DecodeImage and ResizeImage events. However, we only had PaintImage
> emitted when painting an Image element. This adds similar events for
> images that are painted as backgrounds and borders.
> 
> BUG=434905
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=186030

TBR=chrishtr@chromium.org,yurys@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=434905

Review URL: https://codereview.chromium.org/766133002

git-svn-id: svn://svn.chromium.org/blink/trunk@186218 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: fix timeline view after migration to the shadow split.

R=caseq@chromium.org

Review URL: https://codereview.chromium.org/766883003

git-svn-id: svn://svn.chromium.org/blink/trunk@186220 bbb929c8-8fbe-4397-9dbb-9b2b20218538