Adds removable-drive listing for OS X.

chrome/browser/extensions/api/image_writer_private/removable_storage_provider_win.cc

Index: chrome/browser/extensions/api/image_writer_private/removable_storage_provider_win.cc
diff --git a/chrome/browser/extensions/api/image_writer_private/removable_storage_provider_win.cc b/chrome/browser/extensions/api/image_writer_private/removable_storage_provider_win.cc
index ffac02d3b772fa6eaa24f9b2ad207b51a3498c47..097e434ee106f92a68e0dc6e55bc721d4e052a62 100644
--- a/chrome/browser/extensions/api/image_writer_private/removable_storage_provider_win.cc
+++ b/chrome/browser/extensions/api/image_writer_private/removable_storage_provider_win.cc
@@ -151,8 +151,10 @@ bool AddDeviceInfo(HANDLE interface_enumerator,
 
 }  // namespace
 
-bool RemovableStorageProvider::PopulateDeviceList(
-    scoped_refptr<StorageDeviceList> device_list) {
+void RemovableStorageProvider::GetAllDevicesImpl(
+    DeviceListReadyCallback& callback) {
+  scoped_refptr<StorageDeviceList> device_list(new StorageDeviceList);
+
   HDEVINFO interface_enumerator = SetupDiGetClassDevs(
       &DiskClassGuid,
       NULL, // Enumerator.
@@ -162,7 +164,8 @@ bool RemovableStorageProvider::PopulateDeviceList(
 
   if (interface_enumerator == INVALID_HANDLE_VALUE) {
     DPLOG(ERROR) << "SetupDiGetClassDevs failed.";
-    return false;
+    callback.Run(device_list, false);
+    return;
   }
 
   DWORD index = 0;
@@ -184,11 +187,13 @@ bool RemovableStorageProvider::PopulateDeviceList(
   if (error_code != ERROR_NO_MORE_ITEMS) {
     PLOG(ERROR) << "SetupDiEnumDeviceInterfaces failed";
     SetupDiDestroyDeviceInfoList(interface_enumerator);
-    return false;
+    callback.Run(device_list, false);
+    return;
   }
 
   SetupDiDestroyDeviceInfoList(interface_enumerator);
-  return true;
+
+  callback.Run(device_list, true);
 }
 
 } // namespace extensions