Update from https://crrev.com/320343

tools/clang/scripts/plugin_flags.py

Index: tools/clang/scripts/plugin_flags.py
diff --git a/tools/clang/scripts/plugin_flags.py b/tools/clang/scripts/plugin_flags.py
deleted file mode 100755
index 3f61d6bd2a26f4c729d37dd5f5fb2f1ddc6c0af6..0000000000000000000000000000000000000000
--- a/tools/clang/scripts/plugin_flags.py
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/usr/bin/env python
-# Copyright 2015 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.
-
-# This script returns the flags that should be used when GYP_DEFINES contains
-# clang_use_chrome_plugins. The flags are stored in a script so that they can
-# be changed on the bots without requiring a master restart.
-
-import os
-import sys
-
-# Path constants. (All of these should be absolute paths.)
-THIS_DIR = os.path.abspath(os.path.dirname(__file__))
-CHROMIUM_DIR = os.path.abspath(os.path.join(THIS_DIR, '..', '..', '..'))
-CLANG_LIB_PATH = os.path.join(CHROMIUM_DIR, 'third_party', 'llvm-build',
-                              'Release+Asserts', 'lib')
-
-if sys.platform == 'darwin':
-  LIBSUFFIX = 'dylib'
-else:
-  LIBSUFFIX = 'so'
-
-LIB_PATH = os.path.join(
-    CLANG_LIB_PATH,
-    'libFindBadConstructs.' + LIBSUFFIX)
-
-print ('-Xclang -load -Xclang %s'
-       ' -Xclang -add-plugin -Xclang find-bad-constructs') % LIB_PATH