Revert 180822 "Specify clip rects when drawing Mac native widgets"

Revert 180822 "Specify clip rects when drawing Mac native widgets"

Speculatively reverting to address scrollbar dev blocker
BUG=409708
Note there were some conflicts in the TestExpectations file, I did not try to resolve

> Specify clip rects when drawing Mac native widgets
> 
> Add the clip rect as an argument to LocalCurrentGraphicsContext,
> and specify the rect for all callers. Add the rect argument for the one
> direct caller to SkiaBitLocker (the argument will be made a requirement
> once this lands).
> 
> De-duplicate a bunch of rectangle-inflating code and move it into
> ThemeMac.
> 
> For the selected widgets that draw their own focus rings (most don't),
> simply specify the maximum inflation of the clip rect as 16 pixels on
> each side. This appears to be very generous. The correct API call to
> compute this, focusRingMaskBoundsForFrame, was introduced in the
> 10.7 API, and the widgets that draw their own focus rings wouldn't
> need to do so if written against the the 10.7 API.
> 
> BUG=247716
> 
> Review URL: https://codereview.chromium.org/488353003

TBR=ccameron@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181330

[amineer_google, 2014-09-03 17:19:15]

Committed patchset #1 (id:1) manually as r181330.