Fix devtools bugs Fix a spurious layout test failure

Source/bindings/core/dart/DartInspectorDebuggerAgent.h

Index: Source/bindings/core/dart/DartInspectorDebuggerAgent.h
diff --git a/Source/bindings/core/dart/DartInspectorDebuggerAgent.h b/Source/bindings/core/dart/DartInspectorDebuggerAgent.h
index 6ce59f197358ec488f23e5ee17fb2c50e6722f67..6702cf4beee42142c750ef249e637545ab95791f 100644
--- a/Source/bindings/core/dart/DartInspectorDebuggerAgent.h
+++ b/Source/bindings/core/dart/DartInspectorDebuggerAgent.h
@@ -91,7 +91,6 @@ public:
     virtual void canSetScriptSource(ErrorString*, bool* result) { *result = true; }
 
     virtual void init();
-    virtual void setFrontend(InspectorFrontend*);
     virtual void clearFrontend();
     virtual void restore();
 
@@ -208,13 +207,13 @@ protected:
     ScriptCallFrame topCallFrameSkipUnknownSources();
 
     InspectorState* state();
+    InspectorFrontend::Debugger* frontend();
 
     typedef HashMap<String, Script> ScriptsMap;
     typedef HashMap<String, Vector<String>> BreakpointIdToDebugServerBreakpointIdsMap;
     typedef HashMap<String, std::pair<String, BreakpointSource>> DebugServerBreakpointToBreakpointIdAndSourceMap;
 
     DartInjectedScriptManager* m_injectedScriptManager;
-    InspectorFrontend::Debugger* m_frontend;
     RefPtr<DartScriptState> m_pausedScriptState;
     Dart_StackTrace m_currentCallStack;
     ScriptsMap m_scripts;