remove dead methods now that we use specials exclusively for imagefilters

src/pdf/SkPDFDevice.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 "SkPDFDevice.h"
 #include "SkAnnotationKeys.h"
 #include "SkBitmapDevice.h"
@@ skipping 1327 matching lines @@
                                SkXfermode* xmode, const uint16_t indices[],
                                int indexCount, const SkPaint& paint) {
     if (d.fRC->isEmpty()) {
         return;
     }
     // TODO: implement drawVertices
 }
 
 void SkPDFDevice::drawDevice(const SkDraw& d, SkBaseDevice* device,
                              int x, int y, const SkPaint& paint) {
+    SkASSERT(!paint.getImageFilter());
+
     // Check if the source device is really a bitmapdevice (because that's what we returned
     // from createDevice (likely due to an imagefilter)
     SkPixmap pmap;
     if (device->peekPixels(&pmap)) {
         SkBitmap bitmap;
         bitmap.installPixels(pmap);
-        if (paint.getImageFilter()) {
-            this->drawSpriteWithFilter(d, bitmap, x, y, paint);
-        } else {
-            this->drawSprite(d, bitmap, x, y, paint);
-        }
+        this->drawSprite(d, bitmap, x, y, paint);
         return;
     }
 
     // our onCreateCompatibleDevice() always creates SkPDFDevice subclasses.
     SkPDFDevice* pdfDevice = static_cast<SkPDFDevice*>(device);
 
     SkScalar scalarX = SkIntToScalar(x);
     SkScalar scalarY = SkIntToScalar(y);
     for (const RectWithData& l : pdfDevice->fLinkToURLs) {
         SkRect r = l.rect.makeOffset(scalarX, scalarY);
@@ skipping 888 matching lines @@
 }
 
 sk_sp<SkSpecialImage> SkPDFDevice::makeSpecial(const SkImage* image) {
     return SkSpecialImage::MakeFromImage(SkIRect::MakeWH(image->width(), image->height()),
                                          image->makeNonTextureImage());
 }
 
 sk_sp<SkSpecialImage> SkPDFDevice::snapSpecial() {
     return nullptr;
 }