Refactoring AudioDirectiveHandler to support testing

components/copresence/handlers/directive_handler.cc

Index: components/copresence/handlers/directive_handler.cc
diff --git a/components/copresence/handlers/directive_handler.cc b/components/copresence/handlers/directive_handler.cc
index ae0bd306140bb3e7ba66a8200904aca353495e62..7282f9a1e5f05f2f0a4a73888b86a40984fc0215 100644
--- a/components/copresence/handlers/directive_handler.cc
+++ b/components/copresence/handlers/directive_handler.cc
@@ -6,7 +6,7 @@
 
 #include "base/logging.h"
 #include "base/time/time.h"
-#include "components/copresence/handlers/audio/audio_directive_handler.h"
+#include "components/copresence/handlers/audio/audio_directive_handler_impl.h"
 #include "components/copresence/proto/data.pb.h"
 
 namespace copresence {
@@ -16,7 +16,7 @@ DirectiveHandler::DirectiveHandler() {}
 void DirectiveHandler::Initialize(
     const AudioManager::DecodeSamplesCallback& decode_cb,
     const AudioManager::EncodeTokenCallback& encode_cb) {
-  audio_handler_.reset(new AudioDirectiveHandler());
+  audio_handler_.reset(new AudioDirectiveHandlerImpl);
   audio_handler_->Initialize(decode_cb, encode_cb);
 }