[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/protocol/devtools_domain_handler.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/devtools/protocol/devtools_domain_handler.h"
+
+#include "content/browser/devtools/protocol/protocol.h"
+
+namespace content {
+namespace protocol {
+
+DevToolsDomainHandler::DevToolsDomainHandler(const std::string& name)
+    : name_(name) {
+}
+
+DevToolsDomainHandler::~DevToolsDomainHandler() {
+}
+
+void DevToolsDomainHandler::SetRenderFrameHost(RenderFrameHostImpl* host) {
+}
+
+void DevToolsDomainHandler::Wire(UberDispatcher* dispatcher) {
+}
+
+Response DevToolsDomainHandler::Disable() {
+  return Response::OK();
+}
+
+}  // namespace protocol
+}  // namespace content