[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
 import("//third_party/WebKit/public/public_features.gni")
@@ skipping 445 matching lines @@
     "devtools/devtools_manager.cc",
     "devtools/devtools_manager.h",
     "devtools/devtools_session.cc",
     "devtools/devtools_session.h",
     "devtools/forwarding_agent_host.cc",
     "devtools/forwarding_agent_host.h",
     "devtools/page_navigation_throttle.cc",
     "devtools/page_navigation_throttle.h",
     "devtools/protocol/color_picker.cc",
     "devtools/protocol/color_picker.h",
+    "devtools/protocol/devtools_domain_handler.cc",
+    "devtools/protocol/devtools_domain_handler.h",
     "devtools/protocol/dom_handler.cc",
     "devtools/protocol/dom_handler.h",
     "devtools/protocol/emulation_handler.cc",
     "devtools/protocol/emulation_handler.h",
     "devtools/protocol/input_handler.cc",
     "devtools/protocol/input_handler.h",
     "devtools/protocol/inspector_handler.cc",
     "devtools/protocol/inspector_handler.h",
     "devtools/protocol/io_handler.cc",
     "devtools/protocol/io_handler.h",
@@ skipping 1513 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }