fix all instances of "the the"

pkg/analyzer/lib/src/generated/source_io.dart

 // Copyright (c) 2014, 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 analyzer.src.generated.source_io;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_core.dart';
@@ skipping 173 matching lines @@
   @override
   TimestampedData<String> get contents {
     return PerformanceStatistics.io.makeCurrentWhile(() {
       return contentsFromFile;
     });
   }
 
   /**
    * Get the contents and timestamp of the underlying file.
    *
-   * Clients should consider using the the method [AnalysisContext.getContents]
+   * Clients should consider using the method [AnalysisContext.getContents]
    * because contexts can have local overrides of the content of a source that the source is not
    * aware of.
    *
    * @return the contents of the source paired with the modification stamp of the source
    * @throws Exception if the contents of this source could not be accessed
    * See [contents].
    */
   TimestampedData<String> get contentsFromFile {
     return new TimestampedData<String>(
         file.lastModified(), fileReadMode(file.readAsStringSync()));
@@ skipping 346 matching lines @@
   }
 
   /**
    * Return `true` if the given URI is a `file` URI.
    *
    * @param uri the URI being tested
    * @return `true` if the given URI is a `file` URI
    */
   static bool isFileUri(Uri uri) => uri.scheme == FILE_SCHEME;
 }