Switch to use CIPD ninja v1.8.2

https://crrev.com/c/3674981 installed CIPD ninja packages.
This CL switches from the old ninja binaries to them.

Note that this CL doesn't change ninja version. the old/CIPD ninja binaries are v1.8.2.

The differences from the old binaries are
- the CIPD packages don't use chromium's clang.
- the CIPD package for Linux doesn't use chromium's sysroot.
- the min macOS version is 10.13, which was 10.6.
Please also see https://crsrc.org/i/3pp/ninja/install_bootstrap.sh


On Windows, ninja.exe will be installed under .cipd_bin.
But there are many places that assume that ninja.exe exists on depot_tools root. So this CL also copies the ninja.exe from .cipd_bin to root in cipd_bin_setup.bat.

Bug: 931218
Change-Id: Ib67eee5e9b6ad9b2937b789626970d9c85867dbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3674982
Commit-Queue: Junji Watanabe <jwata@google.com>
Reviewed-by: Philipp Wollermann <philwo@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@google.com>

.gitignore

@@ -6,6 +6,9 @@
 /.cipd_client*
 /.versions
 
+# ignore ninja.exe copied from .cipd_bin.
+/ninja.exe
+
 # Ignore "disable auto update" sentinel file.
 .disable_auto_update
 

cipd_bin_setup.bat

@@ -3,4 +3,6 @@
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
 
-"%~dp0\cipd.bat" ensure -log-level warning -ensure-file "%~dp0\cipd_manifest.txt" -root "%~dp0\.cipd_bin"
+call "%~dp0\cipd.bat" ensure -log-level warning -ensure-file "%~dp0\cipd_manifest.txt" -root "%~dp0\.cipd_bin"
+:: copy ninja.exe to the root since many places assume ninja.exe exists in depot_tools.
+copy /y "%~dp0\.cipd_bin\ninja.exe" "%~dp0\ninja.exe" > nul

ninja

@@ -1,40 +1,11 @@
 #!/usr/bin/env bash
 
-# Copyright (c) 2012 Google Inc. All rights reserved.
+# Copyright 2022 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.
 
-OS="$(uname -s)"
-THIS_DIR="$(dirname "${0}")"
+# See revert instructions in cipd_manifest.txt
 
-function print_help() {
-cat <<-EOF
-No prebuilt ninja binary was found for this system.
-Try building your own binary by doing:
-  cd ~
-  git clone https://github.com/ninja-build/ninja.git -b v1.8.2
-  cd ninja && ./configure.py --bootstrap
-Then add ~/ninja/ to your PATH.
-EOF
-}
+MYPATH="$(dirname "${BASH_SOURCE[0]}")"
 
-case "$OS" in
-  Linux)
-    MACHINE=$(uname -m)
-    case "$MACHINE" in
-      x86_64)
-        exec "${THIS_DIR}/ninja-linux64" "$@";;
-      *)
-        echo Unsupported architecture \($MACHINE\) -- unable to run ninja.
-        print_help
-        exit 1;;
-    esac
-    ;;
-  Darwin)    exec "${THIS_DIR}/ninja-mac" "$@";;
-  CYGWIN*)   exec cmd.exe /c $(cygpath -t windows $0).exe "$@";;
-  MINGW*)    cmd.exe //c $0.exe "$@";;
-  MSYS_NT*)  cmd.exe //c $0.exe "$@";;
-  *)         echo "Unsupported OS ${OS}"
-             print_help
-             exit 1;;
-esac
+exec "$MYPATH/.cipd_bin/ninja" "$@"