Implement basic USB device enumeration on Android.

device/usb/usb_device.h

Index: device/usb/usb_device.h
diff --git a/device/usb/usb_device.h b/device/usb/usb_device.h
index 9822a38813fa6ece5cb00c071d8fa8cd4d3d75f8..92d0e295532be355248f85fcc45fe8ae2b7be5ba 100644
--- a/device/usb/usb_device.h
+++ b/device/usb/usb_device.h
@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 
+#include <string>
 #include <vector>
 
 #include "base/callback.h"
@@ -59,10 +60,6 @@ class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
   // Creates a UsbDeviceHandle for further manipulation.
   virtual void Open(const OpenCallback& callback) = 0;
 
-  // Explicitly closes a device handle. This method will be automatically called
-  // by the destructor of a UsbDeviceHandle as well.
-  virtual bool Close(scoped_refptr<UsbDeviceHandle> handle) = 0;
-
   // Gets the UsbConfigDescriptor for the active device configuration or nullptr
   // if the device is unconfigured.
   virtual const UsbConfigDescriptor* GetActiveConfiguration() = 0;