Rename more death test to *DeathTest

Bug: webrtc:11577
Change-Id: If45e322fed3f2935e64c9e4d7e8c096eccc53ac4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176140
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31362}

rtc_base/buffer_unittest.cc

@@ -447,7 +447,7 @@ TEST(BufferTest, TestStruct) {
   EXPECT_EQ(kObsidian, buf[2].stone);
 }
 
-TEST(BufferTest, DieOnUseAfterMove) {
+TEST(BufferDeathTest, DieOnUseAfterMove) {
   Buffer buf(17);
   Buffer buf2 = std::move(buf);
   EXPECT_EQ(buf2.size(), 17u);