Fix logging call in path_observer (issue 14617)

pkg/observe/lib/src/path_observer.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 observe.src.path_observer;
 
 import 'dart:async';
 @MirrorsUsed(metaTargets: const [Reflectable, ObservableProperty],
     override: 'observe.src.path_observer')
 import 'dart:mirrors';
@@ skipping 226 matching lines @@
         return object[MirrorSystem.getName(property)];
       }
     } on NoSuchMethodError catch (e) {
       // Rethrow, unless the type implements noSuchMethod, in which case we
       // interpret the exception as a signal that the method was not found.
       if (!_hasMethod(type, #noSuchMethod)) rethrow;
     }
   }
 
   if (_logger.isLoggable(Level.FINER)) {
-    _logger.log("can't get $property in $object");
+    _logger.finer("can't get $property in $object");
   }
   return null;
 }
 
 bool _setObjectProperty(object, property, value) {
   if (object == null) return false;
 
   if (property is int) {
     if (object is List && property >= 0 && property < object.length) {
       object[property] = value;
@@ skipping 11 matching lines @@
       if (_hasMethod(type, const Symbol('[]='))) {
         object[MirrorSystem.getName(property)] = value;
         return true;
       }
     } on NoSuchMethodError catch (e) {
       if (!_hasMethod(type, #noSuchMethod)) rethrow;
     }
   }
 
   if (_logger.isLoggable(Level.FINER)) {
-    _logger.log("can't set $property in $object");
+    _logger.finer("can't set $property in $object");
   }
   return false;
 }
 
 bool _maybeHasGetter(ClassMirror type, Symbol name) {
   while (type != objectType) {
     final members = type.declarations;
     if (members.containsKey(name)) return true;
     if (members.containsKey(#noSuchMethod)) return true;
     type = _safeSuperclass(type);
@@ skipping 57 matching lines @@
 
 bool _isPathValid(String s) {
   s = s.replaceAll(_spacesRegExp, '');
 
   if (s == '') return true;
   if (s[0] == '.') return false;
   return _pathRegExp.hasMatch(s);
 }
 
 final _logger = new Logger('observe.PathObserver');