mandoline sandbox: prewarm libraries before we raise the sandbox.

mandoline/app/desktop/linux_sandbox.h

Index: mandoline/app/desktop/linux_sandbox.h
diff --git a/mandoline/app/desktop/linux_sandbox.h b/mandoline/app/desktop/linux_sandbox.h
index 82cc084a178d206a17c5351722acafcffb291411..9925617b1988f75638d0da405acc3d1644b8d880 100644
--- a/mandoline/app/desktop/linux_sandbox.h
+++ b/mandoline/app/desktop/linux_sandbox.h
@@ -20,10 +20,6 @@ class LinuxSandbox {
           permissions);
   ~LinuxSandbox();
 
-  // Returns a vector of file permissions needed to load libraries.
-  static std::vector<sandbox::syscall_broker::BrokerFilePermission>
-  GetPermissions();
-
   // Grabs a file descriptor to /proc.
   void Warmup();