[DevTools] Support multiple sessions in content/ domain handlers

content/browser/devtools/protocol/security_handler.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_PROTOCOL_SECURITY_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_SECURITY_HANDLER_H_
 
 #include <unordered_map>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
 class SecurityHandler : public DevToolsDomainHandler,
                         public Security::Backend,
                         public WebContentsObserver {
  public:
   using CertErrorCallback =
       base::Callback<void(content::CertificateRequestResultType)>;
 
   SecurityHandler();
   ~SecurityHandler() override;
 
-  static SecurityHandler* FromAgentHost(DevToolsAgentHostImpl* host);
+  static std::vector<SecurityHandler*> ForAgentHost(
+      DevToolsAgentHostImpl* host);
 
   // DevToolsDomainHandler overrides
   void Wire(UberDispatcher* dispatcher) override;
   void SetRenderFrameHost(RenderFrameHostImpl* host) override;
 
   // Security::Backend overrides.
   Response Enable() override;
   Response Disable() override;
   Response ShowCertificateViewer() override;
   Response HandleCertificateError(int event_id, const String& action) override;
@@ skipping 23 matching lines @@
   CertErrorCallbackMap cert_error_callbacks_;
   bool certificate_errors_overriden_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(SecurityHandler);
 };
 
 }  // namespace protocol
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_SECURITY_HANDLER_H_