MTP: Add support for host cancellation of file transfers.

Change-Id: I72df423f8017286e41adae525e6fbcb6b8440687
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/media/mtp/MtpServer.h b/media/mtp/MtpServer.h
index ca570f0..40f3c52 100644
--- a/media/mtp/MtpServer.h
+++ b/media/mtp/MtpServer.h
@@ -67,7 +67,7 @@
     void                run();
 
 private:
-    void                handleRequest();
+    bool                handleRequest();
 
     MtpResponseCode     doGetDeviceInfo();
     MtpResponseCode     doOpenSession();