[DevTools] Migrate from AgentStateCallbacks to DevToolsAgentHostObserver.

content/browser/devtools/worker_devtools_agent_host.cc

 // Copyright 2014 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.
 
 #include "content/browser/devtools/worker_devtools_agent_host.h"
 
 #include "base/guid.h"
 #include "content/browser/devtools/devtools_protocol_handler.h"
 #include "content/browser/devtools/protocol/schema_handler.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 
 namespace content {
 
 BrowserContext* WorkerDevToolsAgentHost::GetBrowserContext() {
   RenderProcessHost* rph = RenderProcessHost::FromID(worker_id_.first);
   return rph ? rph->GetBrowserContext() : nullptr;
 }
 
 void WorkerDevToolsAgentHost::Attach() {
   if (state_ != WORKER_INSPECTED) {
     state_ = WORKER_INSPECTED;
     AttachToWorker();
   }
   if (RenderProcessHost* host = RenderProcessHost::FromID(worker_id_.first))
     host->Send(
         new DevToolsAgentMsg_Attach(worker_id_.second, GetId(), session_id()));
   OnAttachedStateChanged(true);
-  DevToolsAgentHostImpl::NotifyCallbacks(this, true);
 }
 
 void WorkerDevToolsAgentHost::Detach() {
   if (RenderProcessHost* host = RenderProcessHost::FromID(worker_id_.first))
     host->Send(new DevToolsAgentMsg_Detach(worker_id_.second));
   OnAttachedStateChanged(false);
   if (state_ == WORKER_INSPECTED) {
     state_ = WORKER_UNINSPECTED;
     DetachFromWorker();
   } else if (state_ == WORKER_PAUSED_FOR_REATTACH) {
     state_ = WORKER_UNINSPECTED;
   }
-  DevToolsAgentHostImpl::NotifyCallbacks(this, false);
 }
 
 bool WorkerDevToolsAgentHost::DispatchProtocolMessage(
     const std::string& message) {
   if (state_ != WORKER_INSPECTED)
     return true;
 
   int call_id;
   std::string method;
   if (protocol_handler_->HandleOptionalMessage(session_id(), message, &call_id,
@@ skipping 102 matching lines @@
 
 void WorkerDevToolsAgentHost::OnDispatchOnInspectorFrontend(
     const DevToolsMessageChunk& message) {
   if (!IsAttached())
     return;
 
   chunk_processor_.ProcessChunkedMessageFromAgent(message);
 }
 
 }  // namespace content