virtual/serviceworker/http/tests/serviceworker/fetch-event.html is flaky

BUG=381827
TBR=jsbell

Review URL: https://codereview.chromium.org/314413002

git-svn-id: svn://svn.chromium.org/blink/trunk@175693 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove CompositingUpdateAfterStyleChange

CompositingUpdateAfterStyleChange does the same thing as
CompositingUpdateAfterCompositingInputChange. There's no reason to have two enums.

Also, I've inlined FrameView::updateCompositingLayersAfterStyleChange because
that function just contained a redundant null check.

BUG=332248

Review URL: https://codereview.chromium.org/321573002

git-svn-id: svn://svn.chromium.org/blink/trunk@175694 bbb929c8-8fbe-4397-9dbb-9b2b20218538