Convert device::UsbConfigDescriptor and friends to structs.

extensions/browser/api/usb/usb_api.cc

Index: extensions/browser/api/usb/usb_api.cc
diff --git a/extensions/browser/api/usb/usb_api.cc b/extensions/browser/api/usb/usb_api.cc
index 53f5c5bdf84b9d3d41904b007c2b5460ca9ad67e..5369bf3123c30535ecbd7a8212fa034de1ab996b 100644
--- a/extensions/browser/api/usb/usb_api.cc
+++ b/extensions/browser/api/usb/usb_api.cc
@@ -56,7 +56,6 @@ using device::UsbDeviceFilter;
 using device::UsbDeviceHandle;
 using device::UsbEndpointDescriptor;
 using device::UsbEndpointDirection;
-using device::UsbInterfaceAltSettingDescriptor;
 using device::UsbInterfaceDescriptor;
 using device::UsbService;
 using device::UsbSynchronizationType;
@@ -761,75 +760,54 @@ void UsbListInterfacesFunction::AsyncWorkStart() {
   if (!device_handle.get())
     return;
 
-  scoped_refptr<UsbConfigDescriptor> config =
-      device_handle->GetDevice()->ListInterfaces();
+  const UsbConfigDescriptor& config =
+      device_handle->GetDevice()->GetConfiguration();
 
-  if (!config.get()) {
-    SetError(kErrorCannotListInterfaces);
-    AsyncWorkCompleted();
-    return;
-  }
+  scoped_ptr<base::ListValue> result(new base::ListValue());
 
-  result_.reset(new base::ListValue());
-
-  for (size_t i = 0, num_interfaces = config->GetNumInterfaces();
-       i < num_interfaces;
-       ++i) {
-    scoped_refptr<const UsbInterfaceDescriptor> usb_interface(
-        config->GetInterface(i));
-    for (size_t j = 0, num_descriptors = usb_interface->GetNumAltSettings();
-         j < num_descriptors;
-         ++j) {
-      scoped_refptr<const UsbInterfaceAltSettingDescriptor> descriptor =
-          usb_interface->GetAltSetting(j);
-      std::vector<linked_ptr<EndpointDescriptor> > endpoints;
-      for (size_t k = 0, num_endpoints = descriptor->GetNumEndpoints();
-           k < num_endpoints;
-           k++) {
-        scoped_refptr<const UsbEndpointDescriptor> endpoint =
-            descriptor->GetEndpoint(k);
-        linked_ptr<EndpointDescriptor> endpoint_desc(new EndpointDescriptor());
-
-        TransferType type;
-        Direction direction;
-        SynchronizationType synchronization;
-        UsageType usage;
-
-        if (!ConvertTransferTypeSafely(endpoint->GetTransferType(), &type) ||
-            !ConvertDirectionSafely(endpoint->GetDirection(), &direction) ||
-            !ConvertSynchronizationTypeSafely(
-                endpoint->GetSynchronizationType(), &synchronization) ||
-            !ConvertUsageTypeSafely(endpoint->GetUsageType(), &usage)) {
-          SetError(kErrorCannotListInterfaces);
-          AsyncWorkCompleted();
-          return;
-        }
-
-        endpoint_desc->address = endpoint->GetAddress();
-        endpoint_desc->type = type;
-        endpoint_desc->direction = direction;
-        endpoint_desc->maximum_packet_size = endpoint->GetMaximumPacketSize();
-        endpoint_desc->synchronization = synchronization;
-        endpoint_desc->usage = usage;
-
-        int* polling_interval = new int;
-        endpoint_desc->polling_interval.reset(polling_interval);
-        *polling_interval = endpoint->GetPollingInterval();
-
-        endpoints.push_back(endpoint_desc);
+  for (size_t i = 0; i < config.interfaces.size(); ++i) {
+    const UsbInterfaceDescriptor& usb_interface = config.interfaces[i];
+    std::vector<linked_ptr<EndpointDescriptor> > endpoints;
+
+    for (size_t j = 0; j < usb_interface.endpoints.size(); ++j) {
+      const UsbEndpointDescriptor& endpoint = usb_interface.endpoints[j];
+      linked_ptr<EndpointDescriptor> endpoint_desc(new EndpointDescriptor());
+
+      TransferType type;
+      Direction direction;
+      SynchronizationType synchronization;
+      UsageType usage;
+
+      if (!ConvertTransferTypeSafely(endpoint.transfer_type, &type) ||
+          !ConvertDirectionSafely(endpoint.direction, &direction) ||
+          !ConvertSynchronizationTypeSafely(endpoint.synchronization_type,
+                                            &synchronization) ||
+          !ConvertUsageTypeSafely(endpoint.usage_type, &usage)) {
+        SetError(kErrorCannotListInterfaces);
+        AsyncWorkCompleted();
+        return;
       }
 
-      result_->Append(
-          PopulateInterfaceDescriptor(descriptor->GetInterfaceNumber(),
-                                      descriptor->GetAlternateSetting(),
-                                      descriptor->GetInterfaceClass(),
-                                      descriptor->GetInterfaceSubclass(),
-                                      descriptor->GetInterfaceProtocol(),
-                                      &endpoints));
+      endpoint_desc->address = endpoint.address;
+      endpoint_desc->type = type;
+      endpoint_desc->direction = direction;
+      endpoint_desc->maximum_packet_size = endpoint.maximum_packet_size;
+      endpoint_desc->synchronization = synchronization;
+      endpoint_desc->usage = usage;
+      endpoint_desc->polling_interval.reset(new int(endpoint.polling_interval));
+
+      endpoints.push_back(endpoint_desc);
     }
+
+    result->Append(PopulateInterfaceDescriptor(usb_interface.interface_number,
+                                               usb_interface.alternate_setting,
+                                               usb_interface.interface_class,
+                                               usb_interface.interface_subclass,
+                                               usb_interface.interface_protocol,
+                                               &endpoints));
   }
 
-  SetResult(result_.release());
+  SetResult(result.release());
   AsyncWorkCompleted();
 }