Rename FontConfigInterface font manager files.

src/ports/SkFontMgr_FontConfigInterface.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontConfigInterface.h"
 #include "SkFontConfigTypeface.h"
 #include "SkFontDescriptor.h"
@@ skipping 233 matching lines @@
         fCache.add(face, request.release());
 
         return face;
     }
 };
 
 SK_API SkFontMgr* SkFontMgr_New_FCI(SkFontConfigInterface* fci) {
     SkASSERT(fci);
     return new SkFontMgr_FCI(fci);
 }