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(1) The filename of a <pre> block is now hidden until hover. This fixes the data-filename grey box covering code when the first 1-2 lines of code are long.

(2) In <pre> blocks, <b> and <strike> are more visible

(3) Size of text bumped down slightly to fit more code in but still remain legible. 

(4) Text in <pre> blocks no longer wrap and horizontal scroll is enabled when a line of code is too long.

BUG=none

Review URL: https://codereview.chromium.org/269983002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@268307 0039d316-1c4b-4281-b951-d872f2087c98