Fix hints in the analyzer package.

pkg/analyzer/lib/src/generated/sdk_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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.sdk.io;
 
 import 'dart:io';
@@ skipping 182 matching lines @@
    * discovered.
    */
   String _sdkVersion;
 
   /**
    * The file containing the dart2js executable.
    */
   JavaFile _dart2jsExecutable;
 
   /**
-   * The file containing the dart formatter executable.
-   */
-  JavaFile _dartFmtExecutable;
-
-  /**
    * The file containing the Dartium executable.
    */
   JavaFile _dartiumExecutable;
 
   /**
    * The file containing the pub executable.
    */
   JavaFile _pubExecutable;
 
   /**
@@ skipping 129 matching lines @@
   String get sdkVersion {
     if (_sdkVersion == null) {
       _sdkVersion = DartSdk.DEFAULT_VERSION;
       JavaFile revisionFile =
           new JavaFile.relative(_sdkDirectory, _VERSION_FILE_NAME);
       try {
         String revision = revisionFile.readAsStringSync();
         if (revision != null) {
           _sdkVersion = revision.trim();
         }
-      } on FileSystemException catch (exception) {
+      } on FileSystemException {
         // Fall through to return the default.
       }
     }
     return _sdkVersion;
   }
 
   @override
   List<String> get uris => _libraryMap.uris;
 
   /**
@@ skipping 125 matching lines @@
     if (library == null) {
       return null;
     }
     try {
       JavaFile file = new JavaFile.relative(libraryDirectory, library.path);
       if (!relativePath.isEmpty) {
         file = file.getParentFile();
         file = new JavaFile.relative(file, relativePath);
       }
       return new FileBasedSource.con2(parseUriWithException(dartUri), file);
-    } on URISyntaxException catch (exception) {
+    } on URISyntaxException {
       return null;
     }
   }
 
   /**
    * Return the given [file] if it exists and is executable, or `null` if it
    * does not exist or is not executable.
    */
   JavaFile _verifyExecutable(JavaFile file) =>
       file.isExecutable() ? file : null;
@@ skipping 54 matching lines @@
     SdkLibrariesReader_LibraryBuilder libraryBuilder =
         new SdkLibrariesReader_LibraryBuilder(_useDart2jsPaths);
     // If any syntactic errors were found then don't try to visit the AST
     // structure.
     if (!errorListener.errorReported) {
       unit.accept(libraryBuilder);
     }
     return libraryBuilder.librariesMap;
   }
 }