Remove m_margins member from FrameView

Remove m_margins member from FrameView

This member is properly updated but it is never used. We can thus remove it
entirely, as well as the related code. This actually gets rid of a decent
chunk of code in rendering (including virtual function calls).

It decreases overall binary size by over 10Kb.

R=esprehn, adamk

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165168

[esprehn, 2014-01-15 20:53:10]

lgtm, this is different than the one being used in HTMLBodyElement::insertedInto
?

[Inactive, 2014-01-15 20:55:33]

On 2014/01/15 20:53:10, esprehn wrote:
> lgtm, this is different than the one being used in
HTMLBodyElement::insertedInto
> ?

Yes, HTMLBodyElement::insertedInto() uses HTMLFrameElementBase::marginWidth() /
marginHeight().

[commit-bot: I haz the power, 2014-01-15 20:58:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/136793014/1

[commit-bot: I haz the power, 2014-01-15 22:50:25]

Change committed as 165168