GN: Use std::unique_ptr for owned pointers in VisualStudioWriter.

BUG=602726

Review URL: https://codereview.chromium.org/1883593004

Cr-Original-Commit-Position: refs/heads/master@{#388031}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 31500019dff1f12beb9731da14db3820cba2b991
3 files changed
tree: bb8117187fc4e699ae32292ff8b974fb3e66786b
  1. tools/