[MediaRouter] Replace RouteMessage with PresentationConnectionMessage

chrome/browser/media/router/test_helper.h

Index: chrome/browser/media/router/test_helper.h
diff --git a/chrome/browser/media/router/test_helper.h b/chrome/browser/media/router/test_helper.h
index c9a2d9309a683e14982869a88a81c785ea42d8b0..0b1825d962318098c40837f8493bb732ce4bc7e7 100644
--- a/chrome/browser/media/router/test_helper.h
+++ b/chrome/browser/media/router/test_helper.h
@@ -16,6 +16,7 @@
 #include "chrome/browser/media/router/media_routes_observer.h"
 #include "chrome/browser/media/router/media_sinks_observer.h"
 #include "content/public/browser/presentation_service_delegate.h"
+#include "content/public/common/presentation_connection_message.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace media_router {
@@ -49,6 +50,9 @@ MATCHER_P(StateChangeInfoEquals, other, "") {
          arg.message == other.message;
 }
 
+std::string PresentationConnectionMessageToString(
+    const content::PresentationConnectionMessage& message);
+
 class MockIssuesObserver : public IssuesObserver {
  public:
   explicit MockIssuesObserver(MediaRouter* router);