Cleanup CustomFontData after SVG Fonts removal

SVG Fonts were removed in:
https://codereview.chromium.org/656913006

Remove some leftovers in CustomFontData that were meant
for SVG Fonts.

Review URL: https://codereview.chromium.org/676373003

git-svn-id: svn://svn.chromium.org/blink/trunk@184461 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: place layer details below layers tree, remove chrome icon.

Review URL: https://codereview.chromium.org/679123002

git-svn-id: svn://svn.chromium.org/blink/trunk@184462 bbb929c8-8fbe-4397-9dbb-9b2b20218538