Enable inspector tests disabled when dart:html was switched to JS interop.

Source/core/inspector/InjectedScript.h

Index: Source/core/inspector/InjectedScript.h
diff --git a/Source/core/inspector/InjectedScript.h b/Source/core/inspector/InjectedScript.h
index 92e44fbab42316e6f93cbb5bd4d80e524095b77b..2e0b2efaa36adea0422b4f61c8c81970d35aad15 100644
--- a/Source/core/inspector/InjectedScript.h
+++ b/Source/core/inspector/InjectedScript.h
@@ -116,6 +116,10 @@ public:
 
     void setCustomObjectFormatterEnabled(bool);
 
+    // Added for Dart.
+    ScriptValue injectedScriptObject() { return m_injectedScriptObject; }
+    // End of block added for Dart.
+
 private:
     friend InjectedScript InjectedScriptManager::injectedScriptFor(ScriptState*);
     using InspectedStateAccessCheck = bool (*)(ScriptState*);