Prepare for splitting FrameType into AudioFrameType and VideoFrameType

This cl deprecates the FrameType enum, and adds aliases AudioFrameType
and VideoFrameType.

After downstream usage is updated, the enums will be separated
and be moved out of common_types.h.

Bug: webrtc:6883
Change-Id: I2aaf660169da45f22574b4cbb16aea8522cc07a6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/123184
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27011}
diff --git a/modules/audio_coding/acm2/acm_send_test.h b/modules/audio_coding/acm2/acm_send_test.h
index 24d230b..744d015 100644
--- a/modules/audio_coding/acm2/acm_send_test.h
+++ b/modules/audio_coding/acm2/acm_send_test.h
@@ -50,7 +50,7 @@
   std::unique_ptr<Packet> NextPacket() override;
 
   // Inherited from AudioPacketizationCallback.
-  int32_t SendData(FrameType frame_type,
+  int32_t SendData(AudioFrameType frame_type,
                    uint8_t payload_type,
                    uint32_t timestamp,
                    const uint8_t* payload_data,
@@ -75,7 +75,7 @@
   bool codec_registered_;
   int test_duration_ms_;
   // The following member variables are set whenever SendData() is called.
-  FrameType frame_type_;
+  AudioFrameType frame_type_;
   int payload_type_;
   uint32_t timestamp_;
   uint16_t sequence_number_;