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}

modules/video_coding/utility/quality_scaler_unittest.cc

@@ -117,7 +117,7 @@ class QualityScalerTest : public ::testing::Test,
   std::unique_ptr<MockAdaptationObserver> observer_;
 };
 
-INSTANTIATE_TEST_CASE_P(
+INSTANTIATE_TEST_SUITE_P(
     FieldTrials,
     QualityScalerTest,
     ::testing::Values(

modules/video_coding/utility/simulcast_rate_allocator_unittest.cc

@@ -538,9 +538,9 @@ class ScreenshareRateAllocationTest : public SimulcastRateAllocatorTest {
   }
 };
 
-INSTANTIATE_TEST_CASE_P(ScreenshareTest,
-                        ScreenshareRateAllocationTest,
-                        ::testing::Bool());
+INSTANTIATE_TEST_SUITE_P(ScreenshareTest,
+                         ScreenshareRateAllocationTest,
+                         ::testing::Bool());
 
 TEST_P(ScreenshareRateAllocationTest, BitrateBelowTl0) {
   SetupConferenceScreenshare(GetParam());