Remove various IDs:

- AudioFrame
- AudioCodingModule

BUG=webrtc:4690
TBR=kwiberg@webrtc.org

Review-Url: https://codereview.webrtc.org/3019543002
Cr-Original-Commit-Position: refs/heads/master@{#20005}
Committed: https://webrtc.googlesource.com/src/+/2d0f77585d556d8b11d6269d35149ae9ca14c472
Review-Url: https://codereview.webrtc.org/3019543002
Cr-Commit-Position: refs/heads/master@{#20019}

modules/audio_coding/test/TestVADDTX.cc

@@ -62,8 +62,8 @@ void ActivityMonitor::GetStatistics(uint32_t* counter) {
 }
 
 TestVadDtx::TestVadDtx()
-    : acm_send_(AudioCodingModule::Create(0)),
-      acm_receive_(AudioCodingModule::Create(1)),
+    : acm_send_(AudioCodingModule::Create()),
+      acm_receive_(AudioCodingModule::Create()),
       channel_(new Channel),
       monitor_(new ActivityMonitor) {
   EXPECT_EQ(0, acm_send_->RegisterTransportCallback(channel_.get()));