Remove unnecessary includes in src/pdf/

src/pdf/SkPDFFont.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFFont_DEFINED
 #define SkPDFFont_DEFINED
 
 #include "SkAdvancedTypefaceMetrics.h"
 #include "SkBitSet.h"
 #include "SkPDFTypes.h"
 #include "SkTDArray.h"
 #include "SkTypeface.h"
 
-class SkPaint;
 class SkPDFCanon;
-class SkPDFObjNumMap;
 class SkPDFFont;
 
 class SkPDFGlyphSet : SkNoncopyable {
 public:
     SkPDFGlyphSet();
 
     void set(const uint16_t* glyphIDs, int numGlyphs);
     bool has(uint16_t glyphID) const;
     void merge(const SkPDFGlyphSet& usage);
     void exportTo(SkTDArray<uint32_t>* glyphIDs) const;
@@ skipping 164 matching lines @@
     uint16_t fLastGlyphID;
     sk_sp<const SkAdvancedTypefaceMetrics> fFontInfo;
     sk_sp<SkPDFDict> fDescriptor;
 
     SkAdvancedTypefaceMetrics::FontType fFontType;
 
     typedef SkPDFDict INHERITED;
 };
 
 #endif