DevTools: Allow general editing of author shadow DOM elements

Source/core/inspector/InspectorDOMAgent.cpp

Index: Source/core/inspector/InspectorDOMAgent.cpp
diff --git a/Source/core/inspector/InspectorDOMAgent.cpp b/Source/core/inspector/InspectorDOMAgent.cpp
index 17ad00b81e1fd45d2c8d8ea96973c7525fac7733..241424021ba94cd1d79eecded99cc1a68d798d32 100644
--- a/Source/core/inspector/InspectorDOMAgent.cpp
+++ b/Source/core/inspector/InspectorDOMAgent.cpp
@@ -468,8 +468,8 @@ Element* InspectorDOMAgent::assertEditableElement(ErrorString* errorString, int
     if (!element)
         return 0;
 
-    if (element->isInShadowTree()) {
-        *errorString = "Cannot edit elements from shadow trees";
+    if (element->isInShadowTree() && userAgentShadowRoot(element)) {
+        *errorString = "Cannot edit elements from user-agent shadow trees";
         return 0;
     }