Fix device_policy_remover_generate path

These proto files are generated per toolchain, so this change makes the
action work correctly when compiled inside a non-default toolchain.

Bug: 1129223
Change-Id: I3d040de0f264f92b63e3aa44c63d9f43578ddb66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419696Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808624}

chrome/browser/chromeos/BUILD.gn

@@ -3820,13 +3820,12 @@ device_policy_remover_path = "$target_gen_dir/device_policy_remover.cc"
 action("device_policy_remover_generate") {
   script = "policy/tools/generate_device_policy_remover.py"
   descriptor_pool_path = "//third_party/protobuf/python"
-  symbol_database_path = "$root_build_dir/pyproto"
+  symbol_database_path = "$root_out_dir/pyproto"
 
   # This is provided by //components/policy/proto listed in public_deps.
   # The containing directory is in a separate variable because that's what
   # the script expects as an argument.
-  chrome_device_policy_pb2_dir =
-      "$root_build_dir/pyproto/components/policy/proto"
+  chrome_device_policy_pb2_dir = "$root_out_dir/pyproto/components/policy/proto"
   chrome_device_policy_pb2_path =
       "$chrome_device_policy_pb2_dir/chrome_device_policy_pb2.py"