DevTools: use target-based model accessors only.

LayoutTests/inspector/elements/styles/undo-add-new-rule.html

Index: LayoutTests/inspector/elements/styles/undo-add-new-rule.html
diff --git a/LayoutTests/inspector/elements/styles/undo-add-new-rule.html b/LayoutTests/inspector/elements/styles/undo-add-new-rule.html
index e02371cf071a414c13f0d24e8a80885e00a619da..0ee89c3f97c986396c088afa1b625e572961683f 100644
--- a/LayoutTests/inspector/elements/styles/undo-add-new-rule.html
+++ b/LayoutTests/inspector/elements/styles/undo-add-new-rule.html
@@ -29,7 +29,7 @@ function test()
 
     function step4()
     {
-        WebInspector.domModel.undo();
+        InspectorTest.domModel.undo();
         InspectorTest.selectNodeAndWaitForStyles("other", step5);
     }
 
@@ -42,7 +42,7 @@ function test()
 
     function step6()
     {
-        WebInspector.domModel.redo();
+        InspectorTest.domModel.redo();
         InspectorTest.selectNodeAndWaitForStyles("inspected", step7);
     }