Revert "DevTools: [Styles] Reflect the element pseudo-state in the Styles pane"

This reverts commit 2b163f0d05dca00c81c939be2e31d5165c618b6d.

Live updates of pseudo-class styles break certain user workflows

Conflicts:
	LayoutTests/inspector/styles/pseudo-state-change-expected.txt
	LayoutTests/inspector/styles/pseudo-state-change.html
	Source/devtools/front_end/DOMAgent.js

TBR=vsevik

Review URL: https://codereview.chromium.org/116123005

git-svn-id: svn://svn.chromium.org/blink/trunk@164174 bbb929c8-8fbe-4397-9dbb-9b2b20218538