Fix headless_browsertests failures with PlzNavigate.

content/browser/devtools/protocol/network_handler.h

Index: content/browser/devtools/protocol/network_handler.h
diff --git a/content/browser/devtools/protocol/network_handler.h b/content/browser/devtools/protocol/network_handler.h
index 2ce9dcb1c3d698b12acc21478b1969e0429c26bf..32409ffc906d2d49e92e0505468a64c8bd800d6d 100644
--- a/content/browser/devtools/protocol/network_handler.h
+++ b/content/browser/devtools/protocol/network_handler.h
@@ -10,12 +10,15 @@
 #include "base/macros.h"
 #include "content/browser/devtools/protocol/devtools_domain_handler.h"
 #include "content/browser/devtools/protocol/network.h"
+#include "net/base/net_errors.h"
 #include "net/cookies/canonical_cookie.h"
 
 namespace content {
 
 class DevToolsSession;
 class RenderFrameHostImpl;
+struct BeginNavigationParams;
+struct CommonNavigationParams;
 struct ResourceRequest;
 struct ResourceRequestCompletionStatus;
 struct ResourceResponseHead;
@@ -71,6 +74,9 @@ class NetworkHandler : public DevToolsDomainHandler,
   void NavigationPreloadCompleted(
       const std::string& request_id,
       const ResourceRequestCompletionStatus& completion_status);
+  void NavigationFailed(const CommonNavigationParams& common_params,
+                        const BeginNavigationParams& begin_params,
+                        net::Error error_code);
 
   bool enabled() const { return enabled_; }
   std::string UserAgentOverride() const;