DevTools: Get rid of WebInspector.panels

R=eustas, pfeldman, yurys
BUG=351662

Review URL: https://codereview.chromium.org/268293003

git-svn-id: svn://svn.chromium.org/blink/trunk@173643 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[DevTools] Don't show UI for unavailable overrides.

BUG=353980

Review URL: https://codereview.chromium.org/269953006

git-svn-id: svn://svn.chromium.org/blink/trunk@173644 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: cleanup based on review comments after removal of TreeShared.

There are a couple of comments (in particular SVG stuff) that I
have not addressed. I have filed bug reports for those to make
sure that I get around to revisiting them.

R=haraken@chromium.org, kouhei@chromium.org, tkent@chromium.org
BUG=357163

Review URL: https://codereview.chromium.org/267303004

git-svn-id: svn://svn.chromium.org/blink/trunk@173645 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[oilpan]: Make parking threads for GC timeout in the case parking exceeds 100 MS.

This is to avoid issues where a GC is hanging forever waiting for a thread to reach a safepoint. This should not happen, but in the case it does we would rather abandon the GC and attempt it again later.

R=ager@chromium.org, erik.corry@gmail.com, haraken@chromium.org, oilpan-reviews@chromium.org, tkent@chromium.org, vegorov@chromium.org, zerny@chromium.org
BUG=

Review URL: https://codereview.chromium.org/260723003

git-svn-id: svn://svn.chromium.org/blink/trunk@173646 bbb929c8-8fbe-4397-9dbb-9b2b20218538