LibGfx/WebP: Remove pointless decode_webp_chunk_VP8L() function

The one caller checked the chunk type, so the VERIFY() for that did
nothing.

The VERIFY() for vp8l data only being in files that start with
VP8L or VP8X chunks wasn't completely useless, but also not very
useful.

Remove the now-unused context parameter of decode_webp_image_data().

Userland/Libraries/LibGfx/ImageFormats/WebPLoader.cpp

@@ -299,14 +299,6 @@ static ErrorOr<NonnullRefPtr<Bitmap>> decode_webp_chunk_VP8(Chunk const& vp8_chu
 #endif
 }
 
-static ErrorOr<NonnullRefPtr<Bitmap>> decode_webp_chunk_VP8L(WebPLoadingContext const& context, Chunk const& vp8l_chunk)
-{
-    VERIFY(context.first_chunk->type == FourCC("VP8L") || context.first_chunk->type == FourCC("VP8X"));
-    VERIFY(vp8l_chunk.type == FourCC("VP8L"));
-    auto vp8l_header = TRY(decode_webp_chunk_VP8L_header(vp8l_chunk.data));
-    return decode_webp_chunk_VP8L_contents(vp8l_header);
-}
-
 // https://developers.google.com/speed/webp/docs/riff_container#alpha
 static ErrorOr<void> decode_webp_chunk_ALPH(Chunk const& alph_chunk, Bitmap& bitmap)
 {
@@ -640,11 +632,12 @@ static ErrorOr<ImageData> decode_webp_animation_frame_image_data(ANMFChunk const
     return decode_webp_set_image_data(move(alpha), move(image_data));
 }
 
-static ErrorOr<NonnullRefPtr<Bitmap>> decode_webp_image_data(WebPLoadingContext const& context, ImageData const& image_data)
+static ErrorOr<NonnullRefPtr<Bitmap>> decode_webp_image_data(ImageData const& image_data)
 {
     if (image_data.image_data_chunk.type == FourCC("VP8L")) {
         VERIFY(!image_data.alpha_chunk.has_value());
-        return decode_webp_chunk_VP8L(context, image_data.image_data_chunk);
+        auto vp8l_header = TRY(decode_webp_chunk_VP8L_header(image_data.image_data_chunk.data));
+        return decode_webp_chunk_VP8L_contents(vp8l_header);
     }
 
     VERIFY(image_data.image_data_chunk.type == FourCC("VP8 "));
@@ -693,7 +686,7 @@ static ErrorOr<ImageFrameDescriptor> decode_webp_animation_frame(WebPLoadingCont
         }
 
         auto frame_image_data = TRY(decode_webp_animation_frame_image_data(frame_description));
-        auto frame_bitmap = TRY(decode_webp_image_data(context, frame_image_data));
+        auto frame_bitmap = TRY(decode_webp_image_data(frame_image_data));
         if (static_cast<u32>(frame_bitmap->width()) != frame_description.frame_width || static_cast<u32>(frame_bitmap->height()) != frame_description.frame_height)
             return Error::from_string_literal("WebPImageDecoderPlugin: decoded frame bitmap size doesn't match frame description size");
 
@@ -835,7 +828,7 @@ ErrorOr<ImageFrameDescriptor> WebPImageDecoderPlugin::frame(size_t index)
         }
 
         if (m_context->state < WebPLoadingContext::State::BitmapDecoded) {
-            auto bitmap = TRY(decode_webp_image_data(*m_context, m_context->image_data.value()));
+            auto bitmap = TRY(decode_webp_image_data(m_context->image_data.value()));
 
             // Check that size in VP8X chunk matches dimensions in VP8 or VP8L chunk if both are present.
             if (m_context->first_chunk->type == FourCC("VP8X")) {