Populate details section of tracing based timeline flame chart

Missing pieces: self time and aggregated stats will be addressed in separate CLs.

BUG=361045
R=loislo@chromium.org

Review URL: https://codereview.chromium.org/298123002

git-svn-id: svn://svn.chromium.org/blink/trunk@174799 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove ScriptGlobalObject

- Now that ScriptObject is removed, ScriptGlobalObject is an unnecessary indirection.

- This CL moves ScriptGlobalObject::get() to ScriptState::getFromGlobalObject().

- This CL removes ScriptGlobalObject::set() since it's unused.

BUG=357144

Review URL: https://codereview.chromium.org/293153006

git-svn-id: svn://svn.chromium.org/blink/trunk@174800 bbb929c8-8fbe-4397-9dbb-9b2b20218538