Roll googletest 23574bf2..9855a871

BUG=angleproject:1153

Change-Id: I0b0be8133c04a3ebfed7e9ed20d7375ee5e07903
Reviewed-on: https://chromium-review.googlesource.com/296684
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>

DEPS

@@ -9,7 +9,7 @@ deps = {
   # TODO(kbr): figure out how to better stay in sync with Chromium's
   # versions of googletest and googlemock.
   "src/tests/third_party/googletest":
-      Var('chromium_git') + "/external/googletest.git@23574bf2333f834ff665f894c97bef8a5b33a0a9",
+      Var('chromium_git') + "/external/googletest.git@9855a87157778d39b95eccfb201a9dc90f6d61c6",
 
   "src/tests/third_party/googlemock":
       Var('chromium_git') + "/external/googlemock.git@b2cb211e49d872101d991201362d7b97d7d69910",