web-ui settings: Standard font setting now correlates to WebKit's standard font family only.

BUG=74434
TEST=Verify that changing the 'standard font' only applies to unspecified font styles.
Review URL: http://codereview.chromium.org/6602021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@76463 0039d316-1c4b-4281-b951-d872f2087c98
30 files changed