Stop using Googletest legacy APIs.

Googletest recently started replacing the term Test Case by Test Suite.
From now on, the preferred API is TestSuite*; the older TestCase* API
will be slowly deprecated.

This CL moves WebRTC to the new set of APIs.

More info in [1].

This CL has been generated with this script:

declare -A items
items[TYPED_TEST_CASE]=TYPED_TEST_SUITE
items[TYPED_TEST_CASE_P]=TYPED_TEST_SUITE_P
items[REGISTER_TYPED_TEST_CASE_P]=REGISTER_TYPED_TEST_SUITE_P
items[INSTANTIATE_TYPED_TEST_CASE_P]=INSTANTIATE_TYPED_TEST_SUITE_P
items[INSTANTIATE_TEST_CASE_P]=INSTANTIATE_TEST_SUITE_P
for i in "${!items[@]}"
do
  git ls-files | xargs sed -i "s/\b$i\b/${items[$i]}/g"
done
git cl format

[1] - https://github.com/google/googletest/blob/master/googletest/docs/primer.md#beware-of-the-nomenclature

Bug: None
Change-Id: I5ae191e3046caf347aeee01554d5743548ab0e3f
Reviewed-on: https://webrtc-review.googlesource.com/c/118701
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26494}
diff --git a/common_audio/real_fourier_unittest.cc b/common_audio/real_fourier_unittest.cc
index 1324887..eac4fce 100644
--- a/common_audio/real_fourier_unittest.cc
+++ b/common_audio/real_fourier_unittest.cc
@@ -68,7 +68,7 @@
 };
 
 using FftTypes = ::testing::Types<RealFourierOoura>;
-TYPED_TEST_CASE(RealFourierTest, FftTypes);
+TYPED_TEST_SUITE(RealFourierTest, FftTypes);
 
 TYPED_TEST(RealFourierTest, SimpleForwardTransform) {
   this->real_buffer_[0] = 1.0f;