Embed CSS/JS under Source/web/resources/ as GRD resources

Embed the CSS and JS used for the color chooser and date/time chooser
as GRD resources instead of as C++ arrays using make-file-array.py.

BUG=312586

Review URL: https://codereview.chromium.org/364323002

git-svn-id: svn://svn.chromium.org/blink/trunk@177591 bbb929c8-8fbe-4397-9dbb-9b2b20218538