Chrome-part of disabling web fonts by default while still alowing SVG fonts

(The webkit part is http://codereview.chromium.org/67209/show and 
 http://bugs.webkit.org/show_bug.cgi?id=25239 )

1. Adds '--enable-remote-fonts' command line switch
2. Adds a field ('enable_remote_fonts) to WebPreference
3. Pass the value of enable_remote_fonts to the corresponding field in WebCore::Settings (m_downloadableBinaryFontsEnabled)

BUG=9633

TEST: 1. Run Chrome with and without '--enable-remote-font' command line flag and go to http://www.alistapart.com/d/cssatten/heid.html. Without the flag, the page should be rendered with 'dull-looking ordinary' fonts. With the flag, the page should be rendered with 'decorative' remote fonts.
2. Even without the above flag, Chrome should should get 100/100, with no  boxes in the upper right corner (still has the Linktest Failed error).
Review URL: http://codereview.chromium.org/67210

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@16247 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed