Fix logging call in path_observer (issue 14617)

pkg/observe/lib/src/path_observer.dart

Index: pkg/observe/lib/src/path_observer.dart
diff --git a/pkg/observe/lib/src/path_observer.dart b/pkg/observe/lib/src/path_observer.dart
index 963f31f53783a5bdb8e89f4200724ee1d09a3423..8eab21ad0d4f0090ad8621b4960a5f6a8b9fd09b 100644
--- a/pkg/observe/lib/src/path_observer.dart
+++ b/pkg/observe/lib/src/path_observer.dart
@@ -244,7 +244,7 @@ _getObjectProperty(object, property) {
   }
 
   if (_logger.isLoggable(Level.FINER)) {
-    _logger.log("can't get $property in $object");
+    _logger.finer("can't get $property in $object");
   }
   return null;
 }
@@ -276,7 +276,7 @@ bool _setObjectProperty(object, property, value) {
   }
 
   if (_logger.isLoggable(Level.FINER)) {
-    _logger.log("can't set $property in $object");
+    _logger.finer("can't set $property in $object");
   }
   return false;
 }