replace Stream<ui.Codec> with Future<ui.Codec>

Author: lwj1994

cached_network_image/lib/cached_network_image.dart

@@ -7,4 +7,3 @@ export 'package:flutter_cache_manager/flutter_cache_manager.dart'
 
 export 'src/cached_image_widget.dart';
 export 'src/image_provider/cached_network_image_provider.dart';
-export 'src/image_provider/multi_image_stream_completer.dart';

cached_network_image/lib/src/image_provider/_image_loader.dart

@@ -108,7 +108,6 @@ class ImageLoader implements platform.ImageLoader {
               headers: headers,
               key: cacheKey,
             );
-
       await for (final result in stream) {
         if (result is DownloadProgress) {
           chunkEvents.add(

cached_network_image/lib/src/image_provider/cached_network_image_provider.dart

@@ -1,7 +1,6 @@
 import 'dart:async' show Future, StreamController;
 import 'dart:ui' as ui show Codec;
 
-import 'package:cached_network_image/src/image_provider/multi_image_stream_completer.dart';
 import 'package:cached_network_image_platform_interface/cached_network_image_platform_interface.dart'
     show ErrorListener, ImageRenderMethodForWeb;
 import 'package:cached_network_image_platform_interface/cached_network_image_platform_interface.dart'
@@ -74,8 +73,8 @@ class CachedNetworkImageProvider
     DecoderBufferCallback decode,
   ) {
     final chunkEvents = StreamController<ImageChunkEvent>();
-    final imageStreamCompleter = MultiImageStreamCompleter(
-      codec: _loadBufferAsync(key, chunkEvents, decode),
+    final imageStreamCompleter = MultiFrameImageStreamCompleter(
+      codec: _loadBufferAsync(key, chunkEvents, decode).first,
       chunkEvents: chunkEvents.stream,
       scale: key.scale,
       informationCollector: () sync* {
@@ -128,8 +127,8 @@ class CachedNetworkImageProvider
     ImageDecoderCallback decode,
   ) {
     final chunkEvents = StreamController<ImageChunkEvent>();
-    final imageStreamCompleter = MultiImageStreamCompleter(
-      codec: _loadImageAsync(key, chunkEvents, decode),
+    final imageStreamCompleter = MultiFrameImageStreamCompleter(
+      codec: _loadImageAsync(key, chunkEvents, decode).first,
       chunkEvents: chunkEvents.stream,
       scale: key.scale,
       informationCollector: () sync* {