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It seems it needed to be added to api_page_generator.js. Also, renamed
experimental.fonts.json to experimental.fontSettings.json for consistency.

BUG=114148
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9689054

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@126853 0039d316-1c4b-4281-b951-d872f2087c98