[DevTools] Dedicated frontend for debugging Node.

content/browser/devtools/protocol/target_handler.cc

Index: content/browser/devtools/protocol/target_handler.cc
diff --git a/content/browser/devtools/protocol/target_handler.cc b/content/browser/devtools/protocol/target_handler.cc
index c17b128289aa5d7ed743acbfb635842b61aba894..eb6215d294e96c3bbdb69237c37e4dcc4c5d94f2 100644
--- a/content/browser/devtools/protocol/target_handler.cc
+++ b/content/browser/devtools/protocol/target_handler.cc
@@ -412,7 +412,8 @@ bool TargetHandler::ShouldForceDevToolsAgentHostCreation() {
 }
 
 void TargetHandler::DevToolsAgentHostCreated(DevToolsAgentHost* agent_host) {
-  DCHECK(attached_hosts_.find(agent_host->GetId()) == attached_hosts_.end());
+  // If we start discovering late, all existing agent hosts will be reported,
+  // but we could have already attached to some.
   TargetCreatedInternal(agent_host);
 }