[inspector] use own version of third_party/inspector_protocol

components/ui_devtools/BUILD.gn

 # 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.
 
-_inspector_protocol = "//third_party/WebKit/Source/platform/inspector_protocol"
+_inspector_protocol = "//third_party/inspector_protocol"
 import("$_inspector_protocol/inspector_protocol.gni")
 
 _protocol_generated = [
   "DOM.cpp",
   "DOM.h",
   "Forward.h",
   "Protocol.cpp",
   "Protocol.h",
 ]
 
@@ skipping 10 matching lines @@
   ]
 
   args = [
     "--stamp",
     rebase_path(_stamp, root_build_dir),
     rebase_path("protocol.json", root_build_dir),
   ]
 }
 
 inspector_protocol_generate("protocol_generated_sources") {
+  inspector_protocol_dir = _inspector_protocol
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
   deps = [
     ":protocol_compatibility",
   ]
 
   out_dir = target_gen_dir
   config_file = "inspector_protocol_config.json"
   inputs = [
     "protocol.json",
@@ skipping 22 matching lines @@
     cflags += [ "/wd4800" ]  # Value forced to bool.
   }
 
   deps = [
     ":protocol_generated_sources",
     "//base",
     "//net",
     "//net:http_server",
   ]
 }