Remove Compositing chicken/egg assert disablers in FrameView.

We've removed all the chicken/egg code from the updateCompositingAfter*
methods. So we don't need the disablers anymore.

Also, remove the trace events for these methods. These methods
basically don't do anything anymore. They'll never show up
on a trace.

BUG=343756

Review URL: https://codereview.chromium.org/246973003

git-svn-id: svn://svn.chromium.org/blink/trunk@172304 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Don't bail in RenderLayerRepainter::computeRepaintRects with RAL

With repaint-after-layout enabled, we were updating a renderer's
repaint rect when RenderLayerRepainter::computeRepaintRectsIncludingDescendants
was called, but not when RenderLayerRepainter::computeRepaintRects
was called. Pushing the special handling in RenderLayerRepainter
for RAL down to computeRepaintRects.

This was making us failfast/repaint/scroll-absolute-layer-with-reflection.html
with RAL enabled.

BUG=320139

Review URL: https://codereview.chromium.org/248393002

git-svn-id: svn://svn.chromium.org/blink/trunk@172305 bbb929c8-8fbe-4397-9dbb-9b2b20218538