Clean up a few includes, introduce iwyu.

src/ports/SkFontHost_fontconfig.cpp

 /*
  * Copyright 2008 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"
-#include "SkFontHost_FreeType_common.h"
-#include "SkFontStream.h"
 #include "SkStream.h"
 #include "SkTypeface.h"
 #include "SkTypefaceCache.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 
 SK_DECLARE_STATIC_MUTEX(gFontConfigInterfaceMutex);
 static SkFontConfigInterface* gFontConfigInterface;
 
@@ skipping 127 matching lines @@
     *familyName = fFamilyName;
 }
 
 void FontConfigTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
                                              bool* isLocalStream) const {
     SkString name;
     this->getFamilyName(&name);
     desc->setFamilyName(name.c_str());
     *isLocalStream = SkToBool(this->getLocalStream());
 }