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

Review URL: https://codereview.chromium.org/136793014

git-svn-id: svn://svn.chromium.org/blink/trunk@165168 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove some isPresentationAttribute implementations

All of these seem to check alignAttr, but HTMLElement::isPresentationAttribute
already checks it, so remove the complete implementations.

Review URL: https://codereview.chromium.org/139773002

git-svn-id: svn://svn.chromium.org/blink/trunk@165169 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r165157

http://src.chromium.org/viewvc/blink?view=revision&revision=165157

BUG=327045
TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/140283002

git-svn-id: svn://svn.chromium.org/blink/trunk@165170 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove a dead field. Found by scythe.

No functionality change.

BUG=

Review URL: https://codereview.chromium.org/130483008

git-svn-id: svn://svn.chromium.org/blink/trunk@165171 bbb929c8-8fbe-4397-9dbb-9b2b20218538