DevTools: Rename WebInspector.DOMAgent into WebInspector.DOMModel

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 a3063986d77dc32e5a93904abd544ef79b93bf7a..a4ac3640d959378d76a9e411dc6bef44032befc5 100644
--- a/LayoutTests/inspector/elements/styles/undo-add-new-rule.html
+++ b/LayoutTests/inspector/elements/styles/undo-add-new-rule.html
@@ -30,7 +30,7 @@ function test()
 
     function step4()
     {
-        WebInspector.domAgent.undo();
+        WebInspector.domModel.undo();
         InspectorTest.selectNodeAndWaitForStyles("other", step5);
     }
 
@@ -43,7 +43,7 @@ function test()
 
     function step6()
     {
-        WebInspector.domAgent.redo();
+        WebInspector.domModel.redo();
         InspectorTest.selectNodeAndWaitForStyles("inspected", step7);
     }