[DevTools] Remove Browser domain, switch clients to Target.

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 3296a8ee2f43df9a8dce0147b20e986b6ebbbd8d..5ba040aa412ac4d7671fbb07da1fdb372b489f26 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.h
+++ b/content/browser/devtools/render_frame_devtools_agent_host.h
@@ -40,7 +40,6 @@ class NavigationThrottle;
 class RenderFrameHostImpl;
 
 namespace devtools {
-namespace browser { class BrowserHandler; }
 namespace dom { class DOMHandler; }
 namespace emulation { class EmulationHandler; }
 namespace input { class InputHandler; }
@@ -176,7 +175,6 @@ class CONTENT_EXPORT RenderFrameDevToolsAgentHost
   // Stores per-host state between DisconnectWebContents and ConnectWebContents.
   std::unique_ptr<FrameHostHolder> disconnected_;
 
-  std::unique_ptr<devtools::browser::BrowserHandler> browser_handler_;
   std::unique_ptr<devtools::dom::DOMHandler> dom_handler_;
   std::unique_ptr<devtools::input::InputHandler> input_handler_;
   std::unique_ptr<devtools::inspector::InspectorHandler> inspector_handler_;