DevTools: [CSS] rename "user stylesheet" origin into "injected stylesheet"

The user stylesheets were deleted recently. However, whenever extensions
inject css into the page, they are marked in devtools as "user". This
patch given them a more meaningful name.

BUG=428412
R=vsevik

Review URL: https://codereview.chromium.org/733463008

git-svn-id: svn://svn.chromium.org/blink/trunk@185874 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: fix javascript outline to process all chunks

The patch fixes an off-by-one bug in javascript outline processing
which skipped last chunk.

R=vsevik

Review URL: https://codereview.chromium.org/744323003

git-svn-id: svn://svn.chromium.org/blink/trunk@185877 bbb929c8-8fbe-4397-9dbb-9b2b20218538