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
R=jyasskin@chromium.org, tsepez@chromium.org

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

1 files changed, 1 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index bba48180a9..ec28f17975 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -740,6 +740,7 @@ test("pdfium_unittests") {
     "core/src/fxcrt/fx_system_unittest.cpp",
     "testing/fx_string_testhelpers.cpp",
     "testing/fx_string_testhelpers.h",
+    "third_party/base/nonstd_unique_ptr_unittest.cpp",
   ]
   deps = [
     "//testing/gtest",