Fix lints

@@ -17,7 +17,7 @@
 import 'dart:async';
 import 'dart:typed_data';
 
-import 'package:flutter/foundation.dart';
+import 'package:flutter/foundation.dart' show FlutterError;
 import 'package:http/http.dart' as http;
 
 /// Store data in a cache

@@ -17,9 +17,15 @@
 import 'dart:async';
 import 'dart:typed_data';
 
-import 'package:flutter/foundation.dart';
+import 'package:flutter/foundation.dart'
+    show
+        ErrorDescription,
+        FlutterError,
+        FlutterErrorDetails,
+        InformationCollector,
+        StringProperty;
 import 'package:flutter/rendering.dart' show Rect;
-import 'package:flutter/services.dart';
+import 'package:flutter/services.dart' show MethodCall, MethodChannel;
 import 'package:pdf/pdf.dart';
 
 import 'callback.dart';

@@ -19,7 +19,8 @@ import 'dart:io';
 import 'dart:math';
 import 'dart:typed_data';
 
-import 'package:flutter/foundation.dart';
+import 'package:flutter/foundation.dart'
+    show InformationCollector, StringProperty, kIsWeb;
 import 'package:flutter/material.dart';
 import 'package:pdf/pdf.dart';
 

@@ -82,7 +82,7 @@ class PdfRasterImage extends ImageProvider<PdfRaster> {
   }
 
   @override
-  ImageStreamCompleter load(PdfRaster key, DecoderCallback decode) {
+  ImageStreamCompleter loadBuffer(PdfRaster key, DecoderBufferCallback decode) {
     return OneFrameImageStreamCompleter(_loadAsync());
   }