All strong mode cleaning of dart2js.

pkg/compiler/lib/src/source_file_provider.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library source_file_provider;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:math' as math;
 import 'dart:typed_data';
@@ skipping 112 matching lines @@
   }
   var buffer = new Uint8List(bufferLength);
   file.readIntoSync(buffer, 0, length);
   file.closeSync();
   return buffer;
 }
 
 class CompilerSourceFileProvider extends SourceFileProvider {
   // TODO(johnniwinther): Remove this when no longer needed for the old compiler
   // API.
-  Future<List<int>> call(Uri resourceUri) => readFromUri(resourceUri);
+  Future<List<int>> call(Uri resourceUri) =>
+      readFromUri(resourceUri).then((input) => input.data);
 
   @override
-  Future readFromUri(Uri uri, {InputKind inputKind: InputKind.utf8}) =>
+  Future<api.Input<List<int>>> readFromUri(Uri uri,
+          {InputKind inputKind: InputKind.utf8}) =>
       readBytesFromUri(uri, inputKind);
 }
 
 class FormattingDiagnosticHandler implements CompilerDiagnostics {
   final SourceFileProvider provider;
   bool showWarnings = true;
   bool showHints = true;
   bool verbose = false;
   bool isAborting = false;
   bool enableColors = false;
@@ skipping 294 matching lines @@
           resolvedUri = file;
           break;
         }
       }
     }
     api.Input result = await readBytesFromUri(resolvedUri, inputKind);
     sourceFiles[uri] = sourceFiles[resolvedUri];
     return result;
   }
 }