Merge to XFA: Change nonstd::unique_ptr to take a custom deleter.

Code is mostly stolen from Chromium's scoped_ptr.

- Add unit tests.
- Use this to fix a leak.

BUG=chromium:531408
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1351383004 .

(cherry picked from commit cef2a9c51bee4b987fc813013d45dad6535a9a46)

Review URL: https://codereview.chromium.org/1358163003 .

1 files changed, 1 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index b10819e6d1..703a991455 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1435,6 +1435,7 @@ test("pdfium_unittests") {
     "core/src/fxcrt/fx_basic_wstring_unittest.cpp",
     "testing/fx_string_testhelpers.cpp",
     "testing/fx_string_testhelpers.h",
+    "third_party/base/nonstd_unique_ptr_unittest.cpp",
     "xfa/src/fxbarcode/pdf417/BC_PDF417HighLevelEncoder_unittest.cpp",
     "xfa/src/fxfa/src/parser/xfa_utils_imp_unittest.cpp",
   ]