Delete paint invalidaiton code in RenderLayerModelObject::styleWillChange.

This code should not be necessary, these cases are handled by the mainline
repaint-after-layout machinery.

BUG=391036

Review URL: https://codereview.chromium.org/360193002

git-svn-id: svn://svn.chromium.org/blink/trunk@177431 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Disallow squashing for layers with reflections

We're not smart enough to draw reflections into squashing layers. Instead,
these layers need to be separately composited so we can set up the reflection
layer correctly.

BUG=391022
R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/367163003

git-svn-id: svn://svn.chromium.org/blink/trunk@177432 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r177411

http://src.chromium.org/viewvc/blink?view=revision&revision=177411

BUG=263911
TBR=fmalita@chromium.org

Review URL: https://codereview.chromium.org/368943003

git-svn-id: svn://svn.chromium.org/blink/trunk@177433 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r177420

http://src.chromium.org/viewvc/blink?view=revision&revision=177420

BUG=391052
TBR=lushnikov@chromium.org

Review URL: https://codereview.chromium.org/361293004

git-svn-id: svn://svn.chromium.org/blink/trunk@177434 bbb929c8-8fbe-4397-9dbb-9b2b20218538