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

ppapi/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.
 
 copy("copy_test_files") {
   visibility = [ ":*" ]
   sources = [
     # Keep "test_case.html.mock-http-headers" with "test_case.html".
     "tests/ppapi_nacl_tests_newlib.nmf",
     "tests/test_case.html",
@@ skipping 18 matching lines @@
 
 import("//build/config/features.gni")
 import("//build/config/nacl/config.gni")
 import("//ppapi/ppapi_sources.gni")
 import("//testing/test.gni")
 
 shared_library("ppapi_tests") {
   sources = ppapi_sources.test_common_source_files +
             ppapi_sources.test_trusted_source_files
 
-  configs += [ "//build/config:precompiled_headers" ]
+  configs += [
+    "//build/config:precompiled_headers",
+    "//v8:external_startup_data",
+  ]
+
   defines = [ "GL_GLEXT_PROTOTYPES" ]
   include_dirs = [ "lib/gl/include" ]
 
   deps = [
     ":copy_test_files",
     ":copy_test_files2",
     "//build/config/sanitizers:deps",
     "//ppapi/cpp",
     "//ppapi/shared_impl",
   ]
@@ skipping 303 matching lines @@
     if (target_cpu == "x86" || target_cpu == "x64") {
       data_deps += [
         ":copy_test_files",
         ":nacl_tests_copy(//build/toolchain/nacl:clang_newlib_${target_cpu})",
         ":generate_nmf(//build/toolchain/nacl:glibc_${target_cpu})",
         ":generate_nmf(//build/toolchain/nacl:newlib_pnacl)",
       ]
     }
   }
 }