[chrome.displaySource] Switch mojom targets to use STL types.

extensions/renderer/api/display_source/wifi_display/wifi_display_session.cc

Index: extensions/renderer/api/display_source/wifi_display/wifi_display_session.cc
diff --git a/extensions/renderer/api/display_source/wifi_display/wifi_display_session.cc b/extensions/renderer/api/display_source/wifi_display/wifi_display_session.cc
index e939263348b6d0f1237c1bca15a0bf6537e3383f..709afee6c0323d80143a559b9c49ded8825cd13f 100644
--- a/extensions/renderer/api/display_source/wifi_display/wifi_display_session.cc
+++ b/extensions/renderer/api/display_source/wifi_display/wifi_display_session.cc
@@ -74,8 +74,8 @@ void WiFiDisplaySession::Terminate(const CompletionCallback& callback) {
   teminate_completion_callback_ = callback;
 }
 
-void WiFiDisplaySession::OnConnected(const mojo::String& local_ip_address,
-                                     const mojo::String& sink_ip_address) {
+void WiFiDisplaySession::OnConnected(const std::string& local_ip_address,
+                                     const std::string& sink_ip_address) {
   DCHECK_EQ(DisplaySourceSession::Established, state_);
   local_ip_address_ = local_ip_address;
   media_manager_.reset(
@@ -92,7 +92,7 @@ void WiFiDisplaySession::OnConnected(const mojo::String& local_ip_address,
 }
 
 void WiFiDisplaySession::OnConnectRequestHandled(bool success,
-                                                 const mojo::String& error) {
+                                                 const std::string& error) {
   DCHECK_EQ(DisplaySourceSession::Establishing, state_);
   state_ =
       success ? DisplaySourceSession::Established : DisplaySourceSession::Idle;
@@ -108,19 +108,18 @@ void WiFiDisplaySession::OnTerminated() {
 }
 
 void WiFiDisplaySession::OnDisconnectRequestHandled(bool success,
-                                                    const mojo::String& error) {
+                                                    const std::string& error) {
   RunTerminateCallback(success, error);
 }
 
-void WiFiDisplaySession::OnError(int32_t type,
-                                 const mojo::String& description) {
+void WiFiDisplaySession::OnError(int32_t type, const std::string& description) {
   DCHECK(type > api::display_source::ERROR_TYPE_NONE
          && type <= api::display_source::ERROR_TYPE_LAST);
   DCHECK_EQ(DisplaySourceSession::Established, state_);
   error_callback_.Run(static_cast<ErrorType>(type), description);
 }
 
-void WiFiDisplaySession::OnMessage(const mojo::String& data) {
+void WiFiDisplaySession::OnMessage(const std::string& data) {
   DCHECK_EQ(DisplaySourceSession::Established, state_);
   DCHECK(wfd_source_);
   wfd_source_->RTSPDataReceived(data);