Remove unnecessary includes in src/pdf/

src/pdf/SkPDFBitmap.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorPriv.h"
 #include "SkData.h"
 #include "SkDeflate.h"
 #include "SkImage_Base.h"
 #include "SkJpegInfo.h"
 #include "SkPDFBitmap.h"
 #include "SkPDFCanon.h"
+#include "SkPDFTypes.h"
 #include "SkStream.h"
 #include "SkUnPreMultiply.h"
 
 void image_get_ro_pixels(const SkImage* image, SkBitmap* dst) {
     if(as_IB(image)->getROPixels(dst)
        && dst->dimensions() == image->dimensions()) {
         if (dst->colorType() != kIndex_8_SkColorType) {
             return;
         }
         // We must check to see if the bitmap has a color table.
@@ skipping 502 matching lines @@
 
     sk_sp<SkPDFObject> smask;
     if (!image_compute_is_opaque(image.get())) {
         smask = sk_make_sp<PDFAlphaBitmap>(image);
     }
     #ifdef SK_PDF_IMAGE_STATS
     gRegularImageObjects.fetch_add(1);
     #endif
     return sk_make_sp<PDFDefaultBitmap>(std::move(image), std::move(smask));
 }