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 9b2dfd67aa8c8ffbf87ca57f610385c049999b3c..a9160069636e59b3a46ac3760fe84bc4dec5902f 100644
--- a/components/copresence/handlers/directive_handler.cc
+++ b/components/copresence/handlers/directive_handler.cc
@@ -7,7 +7,7 @@
 #include "base/bind.h"
 #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 {
@@ -15,7 +15,7 @@ namespace copresence {
 // Public functions
 
 DirectiveHandler::DirectiveHandler()
-  : audio_handler_(new AudioDirectiveHandler),
+  : audio_handler_(new AudioDirectiveHandlerImpl),
     whispernet_client_(nullptr) {}
 
 DirectiveHandler::~DirectiveHandler() {}