Revert of Add FontFaceDescriptors IDL dictionary (patchset #4 id:60001 of https://codereview.chromium.org/481453003/)

Reason for revert:
Broke build

http://build.chromium.org/p/chromium.webkit/builders/GPU%20Mac%20Builder/builds/19956

Original issue's description:
> Add FontFaceDescriptors IDL dictionary
> 
> To follow the spec[1]. This is the first place to use IDL dictionary
> execept for testing, so this CL also includes build related changes.
> Existing tests(e.g. fast/css/fontface-constructor-error.html) should
> cover this change.
> 
> [1] http://dev.w3.org/csswg/css-font-loading/#fontface-interface
> 
> BUG=403150
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181610

TBR=haraken@chromium.org,ksakamoto@chromium.org,bashi@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=403150

Review URL: https://codereview.chromium.org/551873004

git-svn-id: svn://svn.chromium.org/blink/trunk@181612 bbb929c8-8fbe-4397-9dbb-9b2b20218538