vold: Refactor Processkiller and add command to return users of a mount point

Signed-off-by: San Mehat <san@google.com>
diff --git a/VolumeManager.cpp b/VolumeManager.cpp
index d778ce2..b21a36e 100644
--- a/VolumeManager.cpp
+++ b/VolumeManager.cpp
@@ -37,8 +37,7 @@
 #include "Loop.h"
 #include "Fat.h"
 #include "Devmapper.h"
-
-extern "C" void KillProcessesWithOpenFiles(const char *, int);
+#include "Process.h"
 
 VolumeManager *VolumeManager::sInstance = NULL;
 
@@ -356,7 +355,7 @@
         else
             action = 0; // Just complain
 
-        KillProcessesWithOpenFiles(mountPoint, action);
+        Process::killProcessesWithOpenFiles(mountPoint, action);
         usleep(1000 * 1000);
     }