Call Python version of oilplan plugin flags script.

Source/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("config.gni")
 if (is_clang) {
   import("//build/config/clang/clang.gni")
 }
 
 visibility = [ "//third_party/WebKit/*" ]
@@ skipping 46 matching lines @@
 
   if (is_linux && current_cpu == "arm") {
     # Due to a bug in gcc arm, we get warnings about uninitialized
     # timesNewRoman.unstatic.3258 and colorTransparent.unstatic.4879.
     cflags += [ "-Wno-uninitialized" ]
   }
 
   if (is_clang) {
     if (blink_gc_plugin && clang_use_chrome_plugins) {
       # TODO(GYP)
-      #'cflags': ['<!@(../../../tools/clang/scripts/blink_gc_plugin_flags.sh enable-oilpan=<(enable_oilpan) dump-graph=<(blink_gc_plugin_dump_graph))'],
+      #'cflags': ['<!@(../../../tools/clang/scripts/blink_gc_plugin_flags.py enable-oilpan=<(enable_oilpan) dump-graph=<(blink_gc_plugin_dump_graph))'],
     }
   }
 }
 
 # The follow configs apply to all targets except for unit tests, which rely on
 # static initializers.
 config("non_test_config") {
   cflags = []
 
   if (is_clang) {
     cflags += [ "-Wglobal-constructors" ]
   }
 }