Remove unnecessary includes in src/pdf/

src/pdf/SkPDFDocument.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorSpace_Base.h"
-#include "SkPDFCanon.h"
 #include "SkPDFCanvas.h"
 #include "SkPDFDevice.h"
 #include "SkPDFDocument.h"
-#include "SkPDFFont.h"
 #include "SkPDFStream.h"
 #include "SkPDFUtils.h"
 #include "SkStream.h"
 
 SkPDFObjectSerializer::SkPDFObjectSerializer() : fBaseOffset(0), fNextToBeSerialized(0) {}
 
 template <class T> static void renew(T* t) { t->~T(); new (t) T; }
 
 SkPDFObjectSerializer::~SkPDFObjectSerializer() {
     for (int i = 0; i < fObjNumMap.objects().count(); ++i) {
@@ skipping 394 matching lines @@
 }
 
 sk_sp<SkDocument> SkDocument::MakePDF(SkWStream* stream,
                                       SkScalar dpi,
                                       const SkDocument::PDFMetadata& metadata,
                                       sk_sp<SkPixelSerializer> jpegEncoder,
                                       bool pdfa) {
     return SkPDFMakeDocument(stream, nullptr, dpi, metadata,
                              std::move(jpegEncoder), pdfa);
 }