[DevTools] Support multiple clients in DevToolsAgentHost

content/browser/devtools/devtools_session.h

Index: content/browser/devtools/devtools_session.h
diff --git a/content/browser/devtools/devtools_session.h b/content/browser/devtools/devtools_session.h
index 42b45c7e495b9c9b5ba5b8784fcefff2d4b78a3f..e6fcfaf065c8597a0cb0270331ded60bd70fcdea 100644
--- a/content/browser/devtools/devtools_session.h
+++ b/content/browser/devtools/devtools_session.h
@@ -44,12 +44,13 @@ class DevToolsSession : public protocol::FrontendChannel {
       DevToolsAgentHostImpl* agent_host,
       const std::string& name) {
     std::vector<Handler*> result;
-    if (agent_host->sessions_.empty())
+    if (agent_host->sessions().empty())
       return result;
-    for (const auto& session : agent_host->sessions_) {
-      auto it = session->handlers_.find(name);
-      if (it != session->handlers_.end())
-        result.push_back(static_cast<Handler*>(it->second.get()));
+    for (auto& it_session : agent_host->sessions()) {
+      DevToolsSession* session = it_session.second;
+      auto it_handler = session->handlers_.find(name);
+      if (it_handler != session->handlers_.end())
+        result.push_back(static_cast<Handler*>(it_handler->second.get()));
     }
     return result;
   }