Revert of Check for an active document in WebPluginContainerImpl::windowClipRect

Revert of Check for an active document in WebPluginContainerImpl::windowClipRect (patchset #1 id:1 of https://codereview.chromium.org/944753004/)

Reason for revert:
This did not fix the crash but it gave us enough info to fix this (in a followup).

Original issue's description:
> Check for an active document in WebPluginContainerImpl::windowClipRect
> 
> This is a speculative fix for crbug.com/459713. The exact cause is not
> clear in our crash reports but this change may fix an issue where the
> document is being destroyed. A Document's m_frame is only reset
> during destruction, after the lifecycle is set to be not active, so
> this patch adds a check for isActive. Additionally, this patch will
> move the crash location if the node's renderer is null.
> 
> BUG=459713
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190582

TBR=eae@chromium.org,esprehn@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=459713, 460821
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=190633

[pdr., 2015-02-23 03:35:02]

Created Revert of Check for an active document in
WebPluginContainerImpl::windowClipRect

[commit-bot: I haz the power, 2015-02-23 03:35:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/947873002/1

[commit-bot: I haz the power, 2015-02-23 03:35:36]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=190633

[eae, 2015-02-23 18:40:12]

LGTM (post facto)