Revert of Use visual studio toolchain from depot_tools for PDFium compilation

build_gyp/find_depot_tools.py

Index: build_gyp/find_depot_tools.py
diff --git a/build_gyp/find_depot_tools.py b/build_gyp/find_depot_tools.py
deleted file mode 100644
index 6ec83b3d5c382d9b907f13b2116f8c0a648086ec..0000000000000000000000000000000000000000
--- a/build_gyp/find_depot_tools.py
+++ /dev/null
@@ -1,60 +0,0 @@
-#!/usr/bin/env python
-# Copyright 2016 PDFium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-"""Small utility function to find depot_tools and add it to the python path.
-
-Will throw an ImportError exception if depot_tools can't be found since it
-imports breakpad.
-
-This can also be used as a standalone script to print out the depot_tools
-directory location.
-"""
-
-import os
-import sys
-
-
-def IsRealDepotTools(path):
-  return os.path.isfile(os.path.join(path, 'gclient.py'))
-
-
-def add_depot_tools_to_path():
-  """Search for depot_tools and add it to sys.path."""
-  # First look if depot_tools is already in PYTHONPATH.
-  for i in sys.path:
-    if i.rstrip(os.sep).endswith('depot_tools') and IsRealDepotTools(i):
-      return i
-  # Then look if depot_tools is in PATH, common case.
-  for i in os.environ['PATH'].split(os.pathsep):
-    if IsRealDepotTools(i):
-      sys.path.append(i.rstrip(os.sep))
-      return i
-  # Rare case, it's not even in PATH, look upward up to root.
-  root_dir = os.path.dirname(os.path.abspath(__file__))
-  previous_dir = os.path.abspath(__file__)
-  while root_dir and root_dir != previous_dir:
-    i = os.path.join(root_dir, 'depot_tools')
-    if IsRealDepotTools(i):
-      sys.path.append(i)
-      return i
-    previous_dir = root_dir
-    root_dir = os.path.dirname(root_dir)
-  print >> sys.stderr, 'Failed to find depot_tools'
-  return None
-
-DEPOT_TOOLS_PATH = add_depot_tools_to_path()
-
-# pylint: disable=W0611
-import breakpad
-
-
-def main():
-  if DEPOT_TOOLS_PATH is None:
-    return 1
-  print DEPOT_TOOLS_PATH
-  return 0
-
-
-if __name__ == '__main__':
-  sys.exit(main())