Reland of [DevTools] Migrate target domain to new generator.

content/browser/devtools/render_frame_devtools_agent_host.h

Index: content/browser/devtools/render_frame_devtools_agent_host.h
diff --git a/content/browser/devtools/render_frame_devtools_agent_host.h b/content/browser/devtools/render_frame_devtools_agent_host.h
index e4fa63e8289775512859889e5db99c0529836171..9a3bd65c6d8bcc0dcd263fcabf17403ec32c6214 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.h
+++ b/content/browser/devtools/render_frame_devtools_agent_host.h
@@ -41,7 +41,6 @@
 
 namespace devtools {
 namespace input { class InputHandler; }
-namespace target { class TargetHandler; }
 }
 
 namespace protocol {
@@ -55,6 +54,7 @@
 class SecurityHandler;
 class ServiceWorkerHandler;
 class StorageHandler;
+class TargetHandler;
 class TracingHandler;
 }  // namespace protocol
 
@@ -193,7 +193,7 @@
   std::unique_ptr<protocol::SecurityHandler> security_handler_;
   std::unique_ptr<protocol::ServiceWorkerHandler> service_worker_handler_;
   std::unique_ptr<protocol::StorageHandler> storage_handler_;
-  std::unique_ptr<devtools::target::TargetHandler> target_handler_;
+  std::unique_ptr<protocol::TargetHandler> target_handler_;
   std::unique_ptr<protocol::TracingHandler> tracing_handler_;
   std::unique_ptr<protocol::EmulationHandler> emulation_handler_;
   std::unique_ptr<DevToolsFrameTraceRecorder> frame_trace_recorder_;