Roll third_party/googletest/src/ a325ad2db..4bd8c4638 (125 commits)

https://chromium.googlesource.com/external/github.com/google/googletest.git/+log/a325ad2db5de..4bd8c4638ada

Created with:
  roll-dep third_party/googletest/src

Change-Id: I963e0b39119ab564754a81d20c38b5641b9230b5
Reviewed-on: https://pdfium-review.googlesource.com/31130
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
diff --git a/third_party/googletest/BUILD.gn b/third_party/googletest/BUILD.gn
index d04d804..e2b4bd6 100644
--- a/third_party/googletest/BUILD.gn
+++ b/third_party/googletest/BUILD.gn
@@ -14,13 +14,12 @@
     # In order to allow regex matches in gtest to be shared between Windows
     # and other systems, we tell gtest to always use its internal engine.
     "GTEST_HAS_POSIX_RE=0",
+
+    # Enables C++11 features.
     "GTEST_LANG_CXX11=1",
 
-    # ::testing::Combine, which is heavily used in Chromium, is gated on
-    # tr1::tuple. Upstream avoids using tr1::tuple on Visual Studio 2017+,
-    # because it causes warnings. We'll take (and ignore) the warnings to keep
-    # our ::testing::Combine.
-    "GTEST_HAS_TR1_TUPLE=1",
+    # Prevents gtest from including both <tr1/tuple> and <tuple>.
+    "GTEST_HAS_TR1_TUPLE=0",
   ]
 
   # Gtest headers need to be able to find themselves.