Remove most remaining webcore points and sizes.

Remove most remaining webcore points and sizes.

The remaining sizes should all be becoming vectors. Some or all of the
remaining points should as well.

The only Int/Float Point/Size types left are in the scrolling and page scaling
code, or in the LayerTilingData.

R=enne
BUG=147395
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=165569

[danakj, 2012-11-01 22:53:56]

This one is pretty mindless throughout. Implicit IntSize->Vector2d is awesome
for this :)

[enne (OOO), 2012-11-01 23:01:01]

lgtm