GN: Replace vector<ParseNode*> with vector<unique_ptr<ParseNode>> in parse_tree.h.

Chromium can now use std::unique_ptr.

BUG=602726

Review URL: https://codereview.chromium.org/1884503003

Cr-Original-Commit-Position: refs/heads/master@{#387958}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6ce99c7025ebaca2747f659da3700a388f627919
7 files changed
tree: 0d42b72d50c4f533e40501dcfcb61817fd75e80e
  1. tools/