[DevTools] Remove old generator in content.

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 2d06edab4cc00212012eff4e0f41406bfa4c9a29..a351cf39ca55c6c38e22d2d84cd498ee9f19a82d 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.h
+++ b/content/browser/devtools/render_frame_devtools_agent_host.h
@@ -33,7 +33,6 @@ namespace content {
 
 class BrowserContext;
 class DevToolsFrameTraceRecorder;
-class DevToolsProtocolHandler;
 class FrameTreeNode;
 class NavigationHandle;
 class NavigationThrottle;
@@ -198,7 +197,6 @@ class CONTENT_EXPORT RenderFrameDevToolsAgentHost
 #if defined(OS_ANDROID)
   std::unique_ptr<device::PowerSaveBlocker> power_save_blocker_;
 #endif
-  std::unique_ptr<DevToolsProtocolHandler> protocol_handler_;
   RenderFrameHostImpl* handlers_frame_host_;
   bool current_frame_crashed_;