json_schema_compiler: Use std::vector<char> for binary values.

chromeos/dbus/fake_shill_third_party_vpn_driver_client.cc

Index: chromeos/dbus/fake_shill_third_party_vpn_driver_client.cc
diff --git a/chromeos/dbus/fake_shill_third_party_vpn_driver_client.cc b/chromeos/dbus/fake_shill_third_party_vpn_driver_client.cc
index 8be3db3d6cbe224852c0051a61f8774f5437ddf4..90d6ebda4db7cdb93b3595ca52aa59c2ceda5daa 100644
--- a/chromeos/dbus/fake_shill_third_party_vpn_driver_client.cc
+++ b/chromeos/dbus/fake_shill_third_party_vpn_driver_client.cc
@@ -57,7 +57,7 @@ void FakeShillThirdPartyVpnDriverClient::UpdateConnectionState(
 
 void FakeShillThirdPartyVpnDriverClient::SendPacket(
     const std::string& object_path_value,
-    const std::string& ip_packet,
+    const std::vector<char>& ip_packet,
     const base::Closure& callback,
     const ShillClientHelper::ErrorCallback& error_callback) {
   base::MessageLoop::current()->PostTask(FROM_HERE, callback);
@@ -65,7 +65,7 @@ void FakeShillThirdPartyVpnDriverClient::SendPacket(
 
 void FakeShillThirdPartyVpnDriverClient::OnPacketReceived(
     const std::string& object_path_value,
-    const std::string& packet) {
+    const std::vector<char>& packet) {
   ObserverMap::iterator it = observer_map_.find(object_path_value);
   if (it == observer_map_.end()) {
     LOG(ERROR) << "Unexpected OnPacketReceived for " << object_path_value;