Revert of Include USB printers in printer list as "provisional" devices.

extensions/common/api/printer_provider/usb_printer_manifest_data.h

Index: extensions/common/api/printer_provider/usb_printer_manifest_data.h
diff --git a/extensions/common/api/printer_provider/usb_printer_manifest_data.h b/extensions/common/api/printer_provider/usb_printer_manifest_data.h
index ed397f0ede05e693386b4208574881edde6ff3a2..fae6053fc3c4573c0c53645be710f1748957a6dd 100644
--- a/extensions/common/api/printer_provider/usb_printer_manifest_data.h
+++ b/extensions/common/api/printer_provider/usb_printer_manifest_data.h
@@ -10,7 +10,6 @@
 #include "extensions/common/extension.h"
 
 namespace device {
-class UsbDevice;
 class UsbDeviceFilter;
 }
 
@@ -31,8 +30,6 @@
   static scoped_ptr<UsbPrinterManifestData> FromValue(const base::Value& value,
                                                       base::string16* error);
 
-  bool SupportsDevice(const scoped_refptr<device::UsbDevice>& device) const;
-
   const std::vector<device::UsbDeviceFilter>& filters() const {
     return filters_;
   }