Fix warnings in dart2js and analyzer caused by Fasta.

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:convert';
 import 'dart:io';
 import 'dart:math' as math;
@@ skipping 70 matching lines @@
       }
       dartCharactersRead += totalLength;
       sourceFiles[resourceUri] = new CachingUtf8BytesSourceFile(
           resourceUri, resourceUri.toString(), result);
       return result;
     });
   }
 
   // TODO(johnniwinther): Remove this when no longer needed for the old compiler
   // API.
-  Future/*<List<int> | String>*/ call(Uri resourceUri) => throw "unimplemented";
+  Future /* <List<int> | String> */ call(Uri resourceUri) {
+    throw "unimplemented";
+  }
 
   relativizeUri(Uri uri) => relativize(cwd, uri, isWindows);
 
   SourceFile getSourceFile(Uri resourceUri) {
     return sourceFiles[resourceUri];
   }
 }
 
 List<int> readAll(String filename) {
   var file = (new File(filename)).openSync();
@@ skipping 310 matching lines @@
           resolvedUri = file;
           break;
         }
       }
     }
     var result = await readUtf8BytesFromUri(resolvedUri);
     sourceFiles[uri] = sourceFiles[resolvedUri];
     return result;
   }
 }