In call/ replace mock macros with unified MOCK_METHOD macro

Bug: webrtc:11564
Change-Id: I81d06041b80ce470e4859c4d0ebad7ff0f831af9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175134
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31276}
diff --git a/call/bitrate_allocator_unittest.cc b/call/bitrate_allocator_unittest.cc
index 1479a47..00fb236 100644
--- a/call/bitrate_allocator_unittest.cc
+++ b/call/bitrate_allocator_unittest.cc
@@ -47,7 +47,10 @@
 
 class MockLimitObserver : public BitrateAllocator::LimitObserver {
  public:
-  MOCK_METHOD1(OnAllocationLimitsChanged, void(BitrateAllocationLimits));
+  MOCK_METHOD(void,
+              OnAllocationLimitsChanged,
+              (BitrateAllocationLimits),
+              (override));
 };
 
 class TestBitrateObserver : public BitrateAllocatorObserver {