Move v8_use_external_startup_data out of //build/config:feature_flags.

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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/browser/browser.gni")
 import("//media/media_options.gni")
 
@@ skipping 118 matching lines @@
       "//third_party/icu",
       "//third_party/leveldatabase",
       "//third_party/libyuv",
       "//third_party/mojo/src/mojo/public/cpp/bindings",
       "//third_party/mojo/src/mojo/public/js",
       "//ui/events/blink",
       "//ui/resources",
       "//ui/surface",
       "//ui/touch_selection",
     ]
+
+    configs += [ "//v8:external_startup_data" ]
   }
 
   configs += [
     "//content:content_implementation",
     "//third_party/WebKit/public:debug_devtools",
   ]
 
   if (toolkit_views) {
     deps += [ "//ui/events" ]
   }
@@ skipping 356 matching lines @@
 
   if (enable_webvr && is_android) {
     sources += [
       "vr/android/cardboard/cardboard_vr_device.cc",
       "vr/android/cardboard/cardboard_vr_device.h",
       "vr/android/cardboard/cardboard_vr_device_provider.cc",
       "vr/android/cardboard/cardboard_vr_device_provider.h",
     ]
   }
 }