PlzNavigate: Fix for the http/tests/inspector/resource-har-conversion.html layout test failure.

third_party/WebKit/Source/web/WebDevToolsAgentImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 80 matching lines @@
                 const WebString& savedState) override;
   void detach() override;
   void continueProgram() override;
   void dispatchOnInspectorBackend(int sessionId,
                                   int callId,
                                   const WebString& method,
                                   const WebString& message) override;
   void inspectElementAt(int sessionId, const WebPoint&) override;
   void failedToRequestDevTools() override;
   WebString evaluateInWebInspectorOverlay(const WebString& script) override;
+  bool cacheDisabled() override;
 
  private:
   WebDevToolsAgentImpl(WebLocalFrameImpl*,
                        WebDevToolsAgentClient*,
                        InspectorOverlay*,
                        bool includeViewAgents);
 
   // InspectorTracingAgent::Client implementation.
   void enableTracing(const WTF::String& categoryFilter) override;
   void disableTracing() override;
@@ skipping 47 matching lines @@
   Member<InspectorTracingAgent> m_tracingAgent;
 
   Member<InspectorSession> m_session;
   bool m_includeViewAgents;
   int m_layerTreeId;
 };
 
 }  // namespace blink
 
 #endif