Revert of Validate vector lengths in ImageHostMsg_DidDownloadImage

Revert of Validate vector lengths in ImageHostMsg_DidDownloadImage (https://codereview.chromium.org/133123006/)

Reason for revert:
Discussion required on whether to call ReceivedBadMessage to kill the renderer or not

Original issue's description:
> Validate vector lengths in ImageHostMsg_DidDownloadImage
> 
> BUG=333038
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245618

TBR=sky@chromium.org,cevans@chromium.org,jln@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=333038
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245661

[ianbeer, 2014-01-17 23:21:02]

Created Revert of Validate vector lengths in ImageHostMsg_DidDownloadImage

[commit-bot: I haz the power, 2014-01-17 23:23:14]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a lowly provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[jln (very slow on Chromium), 2014-01-17 23:53:10]

lgtm

[commit-bot: I haz the power, 2014-01-17 23:54:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ianbeer@chromium.org/131493009/1

[commit-bot: I haz the power, 2014-01-17 23:56:02]

Change committed as 245661