Issue #2657 - Remove -moz-samplesize resize-decoding for low-vram mobiles

Resolves #2657

image/RasterImage.cpp

@@ -72,7 +72,6 @@ RasterImage::RasterImage(ImageURL* aURI /* = nullptr */) :
   mSize(0,0),
   mLockCount(0),
   mDecodeCount(0),
-  mRequestedSampleSize(0),
   mImageProducerID(ImageContainer::AllocateProducerID()),
   mLastFrameID(0),
   mLastImageContainerDrawResult(DrawResult::NOT_READY),
@@ -1200,8 +1199,7 @@ RasterImage::Decode(const IntSize& aSize,
   } else {
     task = DecoderFactory::CreateDecoder(mDecoderType, WrapNotNull(this),
                                          mSourceBuffer, mSize, aSize,
-                                         decoderFlags, surfaceFlags,
-                                         mRequestedSampleSize);
+                                         decoderFlags, surfaceFlags);
   }
 
   // Make sure DecoderFactory was able to create a decoder successfully.
@@ -1228,7 +1226,7 @@ RasterImage::DecodeMetadata(uint32_t aFlags)
   // Create a decoder.
   RefPtr<IDecodingTask> task =
     DecoderFactory::CreateMetadataDecoder(mDecoderType, WrapNotNull(this),
-                                          mSourceBuffer, mRequestedSampleSize);
+                                          mSourceBuffer);
 
   // Make sure DecoderFactory was able to create a decoder successfully.
   if (!task) {