Revert "Switch to use CIPD ninja v1.8.2"

This reverts commit c90a9821.

Reason for revert: 
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket/8811949917908303825/+/u/compile/stdout

Original change's description:
> 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>

Bug: 931218
Change-Id: I08d61dad119a0d23ae9ec8b1ed787dd3915de697
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3686854
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Owners-Override: Takuto Ikuta <tikuta@chromium.org>

.gitignore

@@ -6,9 +6,6 @@
 /.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

@@ -3,6 +3,4 @@
 :: Use of this source code is governed by a BSD-style license that can be
 :: found in the LICENSE file.
 
-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
+"%~dp0\cipd.bat" ensure -log-level warning -ensure-file "%~dp0\cipd_manifest.txt" -root "%~dp0\.cipd_bin"

ninja

 #!/usr/bin/env bash
 
-# Copyright 2022 The Chromium Authors. All rights reserved.
+# Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# See revert instructions in cipd_manifest.txt
+OS="$(uname -s)"
+THIS_DIR="$(dirname "${0}")"
 
-MYPATH="$(dirname "${BASH_SOURCE[0]}")"
+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
+}
 
-exec "$MYPATH/.cipd_bin/ninja" "$@"
+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