[Media Galleries] Ignore Mac PTP volumes mounted with mass storage

chrome/browser/storage_monitor/image_capture_device_manager.mm

Index: chrome/browser/storage_monitor/image_capture_device_manager.mm
diff --git a/chrome/browser/storage_monitor/image_capture_device_manager.mm b/chrome/browser/storage_monitor/image_capture_device_manager.mm
index ae8f907fed69f1ec62d7c6beb8d9f5a09a61f9ff..80aca5a9cefd9462cd1269d70cd4009902ff5a0e 100644
--- a/chrome/browser/storage_monitor/image_capture_device_manager.mm
+++ b/chrome/browser/storage_monitor/image_capture_device_manager.mm
@@ -89,6 +89,11 @@ chrome::ImageCaptureDeviceManager* g_image_capture_device_manager = NULL;
   if (!(addedDevice.type & ICDeviceTypeCamera))
     return;
 
+  // Ignore mass storage attaches -- those will be handled
+  // by Mac's removable storage watcher.
+  if ([addedDevice.transportType isEqualToString:ICTransportTypeMassStorage])
+    return;
+
   ICCameraDevice* cameraDevice =
       base::mac::ObjCCastStrict<ICCameraDevice>(addedDevice);