Remove unused style rules from view-source.css

The rules were added in 2007 for the first version of inspector.
Now DevTools uses its own set of view source style rules.
The removed rules have not been used since several years ago.

Review URL: https://codereview.chromium.org/603153003

git-svn-id: svn://svn.chromium.org/blink/trunk@182713 bbb929c8-8fbe-4397-9dbb-9b2b20218538