Fix hints in the analyzer package.

pkg/analyzer/lib/src/generated/resolver.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 engine.resolver;
 
 import "dart:math" as math;
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/utilities_collection.dart';
@@ skipping 4724 matching lines @@
             // Force an exception to be thrown if the URI is invalid so that we
             // can report the problem.
             parseUriWithException(scriptSourcePath);
             Source scriptSource =
                 _context.sourceFactory.resolveUri(htmlSource, scriptSourcePath);
             script.scriptSource = scriptSource;
             if (!_context.exists(scriptSource)) {
               _reportValueError(HtmlWarningCode.URI_DOES_NOT_EXIST,
                   scriptAttribute, [scriptSourcePath]);
             }
-          } on URISyntaxException catch (exception) {
+          } on URISyntaxException {
             _reportValueError(HtmlWarningCode.INVALID_URI, scriptAttribute,
                 [scriptSourcePath]);
           }
         }
         node.scriptElement = script;
         _scripts.add(script);
       }
     } finally {
       _parentNodes.remove(node);
     }
@@ skipping 2185 matching lines @@
     try {
       parseUriWithException(uriContent);
       Source source =
           _analysisContext.sourceFactory.resolveUri(librarySource, uriContent);
       if (!_analysisContext.exists(source)) {
         _errorListener.onError(new AnalysisError.con2(librarySource,
             uriLiteral.offset, uriLiteral.length,
             CompileTimeErrorCode.URI_DOES_NOT_EXIST, [uriContent]));
       }
       return source;
-    } on URISyntaxException catch (exception) {
+    } on URISyntaxException {
       _errorListener.onError(new AnalysisError.con2(librarySource,
           uriLiteral.offset, uriLiteral.length,
           CompileTimeErrorCode.INVALID_URI, [uriContent]));
     }
     return null;
   }
 
   /**
    * Returns the URI value of the given directive.
    */
@@ skipping 8426 matching lines @@
   }
 
   bool isCatchException(LocalVariableElement element) {
     return catchExceptionElements.contains(element);
   }
 
   bool isCatchStackTrace(LocalVariableElement element) {
     return catchStackTraceElements.contains(element);
   }
 }