Kill apps using PublicVolume when unmounting.

Bug: 24863778
Change-Id: I86a482c6de78afe2e09ca91165000e1b10a42058
diff --git a/PublicVolume.cpp b/PublicVolume.cpp
index 8580da9..e748de6 100644
--- a/PublicVolume.cpp
+++ b/PublicVolume.cpp
@@ -200,6 +200,8 @@
         mFusePid = 0;
     }
 
+    KillProcessesUsingPath(getPath());
+
     ForceUnmount(kAsecPath);
 
     ForceUnmount(mFuseDefault);