support multiple log message handlers in base/logging.h

components/proximity_auth/logging/logging_unittest.cc

Index: components/proximity_auth/logging/logging_unittest.cc
diff --git a/components/proximity_auth/logging/logging_unittest.cc b/components/proximity_auth/logging/logging_unittest.cc
index 9efc5d7f7a5530fb2217d93d3e003b54dbaecf06..2c336ab5f3b4d67fc8bedc97c534604c8d4cb922 100644
--- a/components/proximity_auth/logging/logging_unittest.cc
+++ b/components/proximity_auth/logging/logging_unittest.cc
@@ -43,14 +43,12 @@ class ProximityAuthLoggingTest : public testing::Test {
     LogBuffer::GetInstance()->Clear();
     g_standard_logs.Get().clear();
 
-    previous_handler_ = logging::GetLogMessageHandler();
-    logging::SetLogMessageHandler(&HandleStandardLogMessage);
+    logging::AddLogMessageHandler(&HandleStandardLogMessage);
   }
 
-  void TearDown() override { logging::SetLogMessageHandler(previous_handler_); }
-
- private:
-  logging::LogMessageHandlerFunction previous_handler_;
+  void TearDown() override {
+    logging::RemoveLogMessageHandler(&HandleStandardLogMessage);
+  }
 };
 
 TEST_F(ProximityAuthLoggingTest, LogsSavedToBuffer) {