Remove single client special cases for StyleSheetContents.

Remove single client special cases for StyleSheetContents.

We can also remove all single document checks since in Sky we
don't have the cross document cache so all sheets are always
connected to a single document.

I also did some minor code simplification and removed an
OILPAN ifdef.

R=ojan@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/630674b241ebb0752f88868dc2163bfa9cea1eb1

[esprehn, 2014-12-13 00:50:49]

esprehn@chromium.org changed reviewers:
+ eseidel@chromium.org, ojan@chromium.org

[ojan, 2014-12-13 00:55:38]

lgtm

https://codereview.chromium.org/799143002/diff/1/sky/engine/core/frame/UseCou...
File sky/engine/core/frame/UseCounter.cpp (right):

https://codereview.chromium.org/799143002/diff/1/sky/engine/core/frame/UseCou...
sky/engine/core/frame/UseCounter.cpp:257: // TODO(esprehn): Support this in Sky.
Is this just:
if (sheetContents)
  return getFrom(sheetContents->ownerDocument());

[esprehn, 2014-12-13 01:06:08]

On 2014/12/13 at 00:55:38, ojan wrote:
> lgtm
> 
>
https://codereview.chromium.org/799143002/diff/1/sky/engine/core/frame/UseCou...
> File sky/engine/core/frame/UseCounter.cpp (right):
> 
>
https://codereview.chromium.org/799143002/diff/1/sky/engine/core/frame/UseCou...
> sky/engine/core/frame/UseCounter.cpp:257: // TODO(esprehn): Support this in
Sky.
> Is this just:
> if (sheetContents)
>   return getFrom(sheetContents->ownerDocument());

Yeah, but right now there's no ownerDocument available. I guess I can take the
one from the first client?

[esprehn, 2014-12-13 01:07:46]

On 2014/12/13 at 01:06:08, esprehn wrote:
> On 2014/12/13 at 00:55:38, ojan wrote:
> > lgtm
> > 
> >
https://codereview.chromium.org/799143002/diff/1/sky/engine/core/frame/UseCou...
> > File sky/engine/core/frame/UseCounter.cpp (right):
> > 
> >
https://codereview.chromium.org/799143002/diff/1/sky/engine/core/frame/UseCou...
> > sky/engine/core/frame/UseCounter.cpp:257: // TODO(esprehn): Support this in
Sky.
> > Is this just:
> > if (sheetContents)
> >   return getFrom(sheetContents->ownerDocument());
> 
> Yeah, but right now there's no ownerDocument available. I guess I can take the
one from the first client?

Actually, lets do that in a future patch. There's two different sets of clients
(loading, completed) right now which also doesn't make sense.

[esprehn, 2014-12-13 01:08:49]

Committed patchset #1 (id:1) manually as
630674b241ebb0752f88868dc2163bfa9cea1eb1 (presubmit successful).