DevTools: [SSP] reduce state of StylePropertyTreeElementBase

The patch eliminates StylePropertyTreeElementBase.style field and
replaces it with a getter.

R=vsevik

Review URL: https://codereview.chromium.org/737273002

git-svn-id: svn://svn.chromium.org/blink/trunk@185662 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: NetworkPanel: Split out HARWriter and NetworkTimeCalculator.

NetworkLogView references HARWriter and NetworkTimeCalculator declared in
NetworkPanel.js. This doesn;t seem to be healthy.

BUG=

Review URL: https://codereview.chromium.org/740243003

git-svn-id: svn://svn.chromium.org/blink/trunk@185669 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: continue to record heap object allocations after cross-process navigation

It was broken in https://src.chromium.org/viewvc/blink?revision=177210&view=revision

BUG=435025

Review URL: https://codereview.chromium.org/743143002

git-svn-id: svn://svn.chromium.org/blink/trunk@185671 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: move split panel to shadow DOM.

BUG=417275

Review URL: https://codereview.chromium.org/744003002

git-svn-id: svn://svn.chromium.org/blink/trunk@185672 bbb929c8-8fbe-4397-9dbb-9b2b20218538