[Mac/iOS/GN] Remove setup_toolchain.py since gyp-mac-tool is not needed anymore.

build/toolchain/mac/setup_toolchain.py

Index: build/toolchain/mac/setup_toolchain.py
diff --git a/build/toolchain/mac/setup_toolchain.py b/build/toolchain/mac/setup_toolchain.py
deleted file mode 100644
index 98b50bebcbab3bb6d14826dc5c8f05fbc0cf1664..0000000000000000000000000000000000000000
--- a/build/toolchain/mac/setup_toolchain.py
+++ /dev/null
@@ -1,42 +0,0 @@
-# Copyright (c) 2013 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 os
-import stat
-import sys
-
-def CopyTool(source_path):
-  """Copies the given tool to the current directory, including a warning not
-  to edit it."""
-  with open(source_path) as source_file:
-    tool_source = source_file.readlines()
-
-  # Add header and write it out to the current directory (which should be the
-  # root build dir). Don't write the file if a matching file already exists
-  # because that causes a cascade of unnecessary rebuilds.
-  match = False
-  contents = ''.join([tool_source[0],
-                      '# Generated by setup_toolchain.py do not edit.\n']
-                     + tool_source[1:])
-  out_path = 'gyp-mac-tool'
-  try:
-    with open(out_path, 'rb') as read_tool_file:
-      existing_contents = read_tool_file.read()
-    if existing_contents == contents:
-      match = True
-  except:
-    pass
-  if not match:
-    with open(out_path, 'wb') as write_tool_file:
-      write_tool_file.write(contents)
-  st = os.stat(out_path)
-  if (st.st_mode & stat.S_IEXEC) == 0:
-    # Only chmod when necessary.
-    os.chmod(out_path, st.st_mode | stat.S_IEXEC)
-
-# Find the tool source, it's the first argument, and copy it.
-if len(sys.argv) != 2:
-  print "Need one argument (mac_tool source path)."
-  sys.exit(1)
-CopyTool(sys.argv[1])