Revert of [DevTools] Filter any messages from previous sessions in DevToolsAgentHostImpl

content/browser/devtools/devtools_agent_host_impl.h

Index: content/browser/devtools/devtools_agent_host_impl.h
diff --git a/content/browser/devtools/devtools_agent_host_impl.h b/content/browser/devtools/devtools_agent_host_impl.h
index 3d27cd7260e40d2c5cd4c6cdbb5554908a87c6cf..8474c0a658f96114b9824d9eb461fb9807b04542 100644
--- a/content/browser/devtools/devtools_agent_host_impl.h
+++ b/content/browser/devtools/devtools_agent_host_impl.h
@@ -9,7 +9,6 @@
 
 #include "base/compiler_specific.h"
 #include "content/browser/devtools/devtools_io_context.h"
-#include "content/browser/devtools/protocol/devtools_protocol_delegate.h"
 #include "content/common/content_export.h"
 #include "content/common/devtools_messages.h"
 #include "content/public/browser/devtools_agent_host.h"
@@ -23,8 +22,7 @@
 class BrowserContext;
 
 // Describes interface for managing devtools agents from the browser process.
-class CONTENT_EXPORT DevToolsAgentHostImpl : public DevToolsAgentHost,
-                                             public DevToolsProtocolDelegate {
+class CONTENT_EXPORT DevToolsAgentHostImpl : public DevToolsAgentHost {
  public:
   // Informs the hosted agent that a client host has attached.
   virtual void Attach() = 0;
@@ -46,20 +44,13 @@
   void DisconnectWebContents() override;
   void ConnectWebContents(WebContents* wc) override;
 
-  // DevToolsProtocolDelegate implementation.
-  void SendProtocolResponse(int session_id,
-                            const std::string& message) override;
-  void SendProtocolNotification(const std::string& message) override;
-
  protected:
   DevToolsAgentHostImpl();
   ~DevToolsAgentHostImpl() override;
 
   void HostClosed();
-  void SendMessageToClient(int session_id, const std::string& message);
+  void SendMessageToClient(const std::string& message);
   devtools::DevToolsIOContext* GetIOContext() { return &io_context_; }
-
-  int session_id() { return session_id_; }
 
   static void NotifyCallbacks(DevToolsAgentHostImpl* agent_host, bool attached);
 
@@ -68,14 +59,13 @@
   void InnerDetach();
 
   const std::string id_;
-  int session_id_;
   DevToolsAgentHostClient* client_;
   devtools::DevToolsIOContext io_context_;
 };
 
 class DevToolsMessageChunkProcessor {
  public:
-  using SendMessageCallback = base::Callback<void(int, const std::string&)>;
+  using SendMessageCallback = base::Callback<void(const std::string&)>;
   explicit DevToolsMessageChunkProcessor(const SendMessageCallback& callback);
   ~DevToolsMessageChunkProcessor();