gn BUILD fixes for disabling enable_extensions and use_ash feature flags.

chrome/browser/devtools/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.
 
 if (!is_android) {
   import("//build/config/features.gni")
   import("//tools/grit/grit_rule.gni")
 }
 
 action("devtools_protocol_constants") {
@@ skipping 56 matching lines @@
     "//content/public/browser",
     "//net",
   ]
 
   if (!is_android) {
     deps += [
       "//chrome:extra_resources",
       "//chrome:resources",
       "//chrome:strings",
       "//chrome/app/theme:theme_resources",
-      "//chrome/common/extensions/api",
       "//components/devtools_http_handler",
       "//net:http_server",
       "//skia",
       "//third_party/icu",
       "//third_party/leveldatabase",
     ]
+    if (enable_extensions) {
+      deps += [ "//chrome/common/extensions/api" ]
+    }
     sources += [
       "chrome_devtools_discovery_provider.cc",
       "chrome_devtools_discovery_provider.h",
       "device/adb/adb_client_socket.cc",
       "device/adb/adb_client_socket.h",
       "device/adb/adb_device_provider.cc",
       "device/adb/adb_device_provider.h",
       "device/android_device_info_query.cc",
       "device/android_device_manager.cc",
       "device/android_device_manager.h",
@@ skipping 40 matching lines @@
       "remote_debugging_server.h",
     ]
     if (enable_service_discovery) {
       sources += [
         "device/cast_device_provider.cc",
         "device/cast_device_provider.h",
       ]
     }
   }
 }