Rename FontConfigInterface font manager files.

BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
 }
 
 skia_public_includes = [
   "include/android",
@@ skipping 243 matching lines @@
   if (is_linux) {
     deps += [
       "third_party:fontconfig",
       "third_party:freetype2",
     ]
     sources += [
       "src/ports/SkFontConfigInterface_direct.cpp",
       "src/ports/SkFontConfigInterface_direct_factory.cpp",
       "src/ports/SkFontHost_FreeType.cpp",
       "src/ports/SkFontHost_FreeType_common.cpp",
+      "src/ports/SkFontMgr_FontConfigInterface.cpp",
       "src/ports/SkFontMgr_fontconfig.cpp",
       "src/ports/SkFontMgr_fontconfig_factory.cpp",
     ]
   }
 
   if (is_mac) {
     sources += [
       "src/ports/SkFontHost_mac.cpp",
       "src/ports/SkImageEncoder_CG.cpp",
       "src/ports/SkImageGeneratorCG.cpp",
@@ skipping 201 matching lines @@
       ":flags",
       ":gm",
       ":gpu_tool_utils",
       ":skia",
       ":tool_utils",
       "//third_party/jsoncpp",
     ]
     testonly = true
   }
 }