PixelPaint: Remove unused Image::write_to_file() method

This seems to be a remnant from before FileSystemAccessClient was used.

Userland/Applications/PixelPaint/Image.cpp

@@ -14,7 +14,6 @@
 #include <AK/JsonObjectSerializer.h>
 #include <AK/JsonValue.h>
 #include <AK/StringBuilder.h>
-#include <LibCore/MappedFile.h>
 #include <LibGUI/Painter.h>
 #include <LibGfx/BMPWriter.h>
 #include <LibGfx/Bitmap.h>
@@ -149,19 +148,6 @@ void Image::serialize_as_json(JsonObjectSerializer<StringBuilder>& json) const
     }
 }
 
-ErrorOr<void> Image::write_to_file(String const& file_path) const
-{
-    StringBuilder builder;
-    auto json = MUST(JsonObjectSerializer<>::try_create(builder));
-    serialize_as_json(json);
-    MUST(json.finish());
-
-    auto file = TRY(Core::File::open(file_path, (Core::OpenMode)(Core::OpenMode::WriteOnly | Core::OpenMode::Truncate)));
-    if (!file->write(builder.string_view()))
-        return Error::from_errno(file->error());
-    return {};
-}
-
 ErrorOr<NonnullRefPtr<Gfx::Bitmap>> Image::try_compose_bitmap(Gfx::BitmapFormat format) const
 {
     auto bitmap = TRY(Gfx::Bitmap::try_create(format, m_size));

Userland/Applications/PixelPaint/Image.h

@@ -73,7 +73,6 @@ public:
     void paint_into(GUI::Painter&, Gfx::IntRect const& dest_rect) const;
 
     void serialize_as_json(JsonObjectSerializer<StringBuilder>& json) const;
-    ErrorOr<void> write_to_file(String const& file_path) const;
     ErrorOr<void> export_bmp_to_file(Core::File&, bool preserve_alpha_channel);
     ErrorOr<void> export_png_to_file(Core::File&, bool preserve_alpha_channel);
     ErrorOr<void> export_qoi_to_file(Core::File&) const;