Change surroundingDeclaration to DeclarationMirror.owner

pkg/dartdoc/lib/mirrors.dart

Index: pkg/dartdoc/lib/mirrors.dart
diff --git a/pkg/dartdoc/lib/mirrors.dart b/pkg/dartdoc/lib/mirrors.dart
index 804cc7ed1da7024585c76e3d37a240b08aa0474e..4e05cfa6304483b31def3fc73180369dc9c4aaf1 100644
--- a/pkg/dartdoc/lib/mirrors.dart
+++ b/pkg/dartdoc/lib/mirrors.dart
@@ -107,6 +107,14 @@ abstract class DeclarationMirror implements Mirror {
    * The source location of this Dart language entity.
    */
   SourceLocation get location;
+
+  /**
+   * A mirror on the owner of this function. This is the declaration immediately
+   * surrounding the reflectee.
+   *
+   * Note that for libraries, the owner will be [:null:].
+   */
+  DeclarationMirror get owner;
 }
 
 /**
@@ -302,12 +310,6 @@ abstract class TypedefMirror implements ClassMirror {
  */
 abstract class MemberMirror implements DeclarationMirror {
   /**
-   * Returns a mirror on the declaration immediately surrounding the reflectee.
-   * This could be a class, interface, library or another method or function.
-   */
-  ObjectMirror get surroundingDeclaration;
-
-  /**
    * Returns true if this is a top level member, i.e. a member not within a
    * type.
    */