Revert of [DevTools] Make DevTools clients talk directly to DevToolsAgentHost instead of using DevToolsManage…

apps/app_window_registry.cc

Index: apps/app_window_registry.cc
diff --git a/apps/app_window_registry.cc b/apps/app_window_registry.cc
index 79a3373eba227d8492d70f34afb039ca658d4aee..67c836ab35a07625069f2af28b595ebe0a5fd02c 100644
--- a/apps/app_window_registry.cc
+++ b/apps/app_window_registry.cc
@@ -13,6 +13,7 @@
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/devtools_agent_host.h"
+#include "content/public/browser/devtools_manager.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/site_instance.h"
@@ -71,11 +72,13 @@
     : context_(context),
       devtools_callback_(base::Bind(&AppWindowRegistry::OnDevToolsStateChanged,
                                     base::Unretained(this))) {
-  content::DevToolsAgentHost::AddAgentStateCallback(devtools_callback_);
+  content::DevToolsManager::GetInstance()->AddAgentStateCallback(
+      devtools_callback_);
 }
 
 AppWindowRegistry::~AppWindowRegistry() {
-  content::DevToolsAgentHost::RemoveAgentStateCallback(devtools_callback_);
+  content::DevToolsManager::GetInstance()->RemoveAgentStateCallback(
+      devtools_callback_);
 }
 
 // static