ensure_bootstrap/update_depot_tools: drop cwd symlink resolution

This was added long ago to workaround svn behavior with symlinked dirs.
We haven't used svn in years, so drop this logic to simplify.

Bug: 1469696
Change-Id: Ic881ec74b1a3caa002a131be48259a56be30d4f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4745419
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>
Reviewed-by: Aravind Vasudevan <aravindvasudev@google.com>

ensure_bootstrap

@@ -23,9 +23,6 @@ if [ $MINGW = 0 ]; then
   base_dir="${0%/*}"
 else
   base_dir=$(dirname "${BASH_SOURCE[0]}")
-  if [ -L "$base_dir" ]; then
-    base_dir=`cd "$base_dir" && pwd -P`
-  fi
 
   # Don't bootstrap Python 3 on windows, since it is already done by
   # bootstrap/win_tools.bat.

update_depot_tools

@@ -34,9 +34,6 @@ if [ $MINGW = 0 ]; then
   base_dir="${0%/*}"
 else
   base_dir=$(dirname "$0")
-  if [ -L "$base_dir" ]; then
-    base_dir=`cd "$base_dir" && pwd -P`
-  fi
 fi
 
 if [ -e "$base_dir/.disable_auto_update" ]; then