Avoid fetching RFH from navigation handle for not committed navigations.

content/browser/devtools/render_frame_devtools_agent_host.cc

Index: content/browser/devtools/render_frame_devtools_agent_host.cc
diff --git a/content/browser/devtools/render_frame_devtools_agent_host.cc b/content/browser/devtools/render_frame_devtools_agent_host.cc
index e5d64bff2495b7f09f841a5510aeccd5034d340d..478d1f0fb6b08056be7f2beb6cc04e58c718fef4 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.cc
+++ b/content/browser/devtools/render_frame_devtools_agent_host.cc
@@ -657,8 +657,8 @@ void RenderFrameDevToolsAgentHost::DidFinishNavigation(
       }
       if (session())
         protocol::TargetHandler::FromSession(session())->UpdateServiceWorkers();
-    } else if (pending_ &&
-               pending_->host() == navigation_handle->GetRenderFrameHost()) {
+    } else if (pending_ && pending_->host()->GetFrameTreeNodeId() ==
+                               navigation_handle->GetFrameTreeNodeId()) {
       DiscardPending();
     }
     DCHECK(CheckConsistency());