chrome: Cleanup class/struct forward declarations

chrome/browser/usb/web_usb_chooser_service.h

Index: chrome/browser/usb/web_usb_chooser_service.h
diff --git a/chrome/browser/usb/web_usb_chooser_service.h b/chrome/browser/usb/web_usb_chooser_service.h
index 8b5be76b75ce02004c01360a79c2d470dc97685f..0b98830837ca0b2193b7a9f7975e6b8f433672e8 100644
--- a/chrome/browser/usb/web_usb_chooser_service.h
+++ b/chrome/browser/usb/web_usb_chooser_service.h
@@ -17,10 +17,6 @@ namespace content {
 class RenderFrameHost;
 }
 
-namespace device {
-class UsbDevice;
-}
-
 // Implementation of the public device::usb::ChooserService interface.
 // This interface can be used by a webpage to request permission from user
 // to access a certain device.