[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/worker_devtools_agent_host.h

Index: content/browser/devtools/worker_devtools_agent_host.h
diff --git a/content/browser/devtools/worker_devtools_agent_host.h b/content/browser/devtools/worker_devtools_agent_host.h
index d0926effb057d5c8d49d5b39470a4707c14ee4f5..df4f6cb0cdf6271e5b03d02becf81f92ab32f8db 100644
--- a/content/browser/devtools/worker_devtools_agent_host.h
+++ b/content/browser/devtools/worker_devtools_agent_host.h
@@ -11,12 +11,6 @@
 
 namespace content {
 
-namespace protocol {
-class InspectorHandler;
-class NetworkHandler;
-class SchemaHandler;
-}
-
 class BrowserContext;
 
 class WorkerDevToolsAgentHost : public DevToolsAgentHostImpl,
@@ -26,11 +20,13 @@ class WorkerDevToolsAgentHost : public DevToolsAgentHostImpl,
 
   // DevToolsAgentHost override.
   BrowserContext* GetBrowserContext() override;
-  bool DispatchProtocolMessage(const std::string& message) override;
 
   // DevToolsAgentHostImpl overrides.
-  void Attach() override;
-  void Detach() override;
+  void AttachSession(DevToolsSession* session) override;
+  void DetachSession(int session_id) override;
+  bool DispatchProtocolMessage(
+      DevToolsSession* session,
+      const std::string& message) override;
 
   // IPC::Listener implementation.
   bool OnMessageReceived(const IPC::Message& msg) override;
@@ -66,9 +62,6 @@ class WorkerDevToolsAgentHost : public DevToolsAgentHostImpl,
   void WorkerCreated();
   void OnDispatchOnInspectorFrontend(const DevToolsMessageChunk& message);
 
-  std::unique_ptr<protocol::InspectorHandler> inspector_handler_;
-  std::unique_ptr<protocol::NetworkHandler> network_handler_;
-  std::unique_ptr<protocol::SchemaHandler> schema_handler_;
   DevToolsMessageChunkProcessor chunk_processor_;
   WorkerState state_;
   WorkerId worker_id_;