[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/protocol/tethering_handler.cc

Index: content/browser/devtools/protocol/tethering_handler.cc
diff --git a/content/browser/devtools/protocol/tethering_handler.cc b/content/browser/devtools/protocol/tethering_handler.cc
index 62f56063404a204c275f7f7039fae226e52843ea..d20b325ca12e5a8c2a2c025ec406610bed915f4a 100644
--- a/content/browser/devtools/protocol/tethering_handler.cc
+++ b/content/browser/devtools/protocol/tethering_handler.cc
@@ -320,7 +320,8 @@ TetheringHandler::TetheringImpl* TetheringHandler::impl_ = nullptr;
 TetheringHandler::TetheringHandler(
     const CreateServerSocketCallback& socket_callback,
     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
-    : socket_callback_(socket_callback),
+    : DevToolsDomainHandler(Tethering::Metainfo::domainName),
+      socket_callback_(socket_callback),
       task_runner_(task_runner),
       is_active_(false),
       weak_factory_(this) {
@@ -338,10 +339,6 @@ void TetheringHandler::Wire(UberDispatcher* dispatcher) {
   Tethering::Dispatcher::wire(dispatcher, this);
 }
 
-Response TetheringHandler::Disable() {
-  return Response::OK();
-}
-
 void TetheringHandler::Accepted(uint16_t port, const std::string& name) {
   frontend_->Accepted(port, name);
 }