DevTools: Remove the extensions->elements dependency

R=eustas, pfeldman
NOTRY=true

Review URL: https://codereview.chromium.org/164193006

git-svn-id: svn://svn.chromium.org/blink/trunk@167197 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: unskip couple of inspector tests on Linux

This patch brings back couple of inspector tests on Linux as they seem
to be working.

BUG=
TBR=pfeldman,vsevik

Review URL: https://codereview.chromium.org/166733002

git-svn-id: svn://svn.chromium.org/blink/trunk@167198 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: [JsDocValidator] Do not print Rhino stacktraces

This clutters the output considerably.

R=eustas, pfeldman, vsevik
NOTRY=true

Review URL: https://codereview.chromium.org/166483003

git-svn-id: svn://svn.chromium.org/blink/trunk@167199 bbb929c8-8fbe-4397-9dbb-9b2b20218538