[DevTools] filter any messages from previous session in DevToolsAgentHostImpl

content/content_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../components/url_formatter/url_formatter.gyp:url_formatter',
     '../crypto/crypto.gyp:crypto',
     '../device/battery/battery.gyp:device_battery',
@@ skipping 526 matching lines @@
       'browser/devtools/devtools_manager.cc',
       'browser/devtools/devtools_manager.h',
       'browser/devtools/devtools_netlog_observer.cc',
       'browser/devtools/devtools_netlog_observer.h',
       'browser/devtools/devtools_protocol_handler.cc',
       'browser/devtools/devtools_protocol_handler.h',
       'browser/devtools/forwarding_agent_host.cc',
       'browser/devtools/forwarding_agent_host.h',
       'browser/devtools/protocol/color_picker.cc',
       'browser/devtools/protocol/color_picker.h',
+      'browser/devtools/protocol/devtools_protocol_delegate.h',
       'browser/devtools/protocol/devtools_protocol_client.cc',
       'browser/devtools/protocol/devtools_protocol_client.h',
       'browser/devtools/protocol/dom_handler.cc',
       'browser/devtools/protocol/dom_handler.h',
       'browser/devtools/protocol/emulation_handler.cc',
       'browser/devtools/protocol/emulation_handler.h',
       'browser/devtools/protocol/input_handler.cc',
       'browser/devtools/protocol/input_handler.h',
       'browser/devtools/protocol/inspector_handler.cc',
       'browser/devtools/protocol/inspector_handler.h',
@@ skipping 1622 matching lines @@
     ['enable_webvr==1 and OS=="android"', {
       'sources': [
         'browser/vr/android/cardboard/cardboard_vr_device.cc',
         'browser/vr/android/cardboard/cardboard_vr_device.h',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.cc',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.h',
       ],
     }],
   ],
 }