Revert r251271 "Setuid sandbox: exit(2) on SIGABRT" Make Linux build again.

sandbox/linux/suid/sandbox.c

Index: sandbox/linux/suid/sandbox.c
diff --git a/sandbox/linux/suid/sandbox.c b/sandbox/linux/suid/sandbox.c
index 78c9e068e92aec76ee3745b3eda2fcf47c8d5175..2dd78ef1eefbc8e68f8326e6bbb54b0dbfeb9195 100644
--- a/sandbox/linux/suid/sandbox.c
+++ b/sandbox/linux/suid/sandbox.c
@@ -58,12 +58,6 @@ static void FatalError(const char *msg, ...) {
   _exit(1);
 }
 
-static void ExitWithErrorSignalHandler(int signal) {
-  const char msg[] = "\nThe setuid sandbox got signaled, exiting.\n";
-  (void) write(2, msg, sizeof(msg) - 1);
-  _exit(1);
-}
-
 // We will chroot() to the helper's /proc/self directory. Anything there will
 // not exist anymore if we make sure to wait() for the helper.
 //
@@ -201,15 +195,6 @@ static void WaitForChildAndExit(pid_t child_pid) {
   int exit_code = -1;
   siginfo_t reaped_child_info;
 
-  // Don't "Core" on SIGABRT. SIGABRT is sent by the Chrome OS session manager
-  // when things are hanging.
-  // Here, the current process is going to waitid() and _exit(), so there is no
-  // point in generating a crash report. The child process is the one
-  // blocking us.
-  if (signal(SIGABRT, ExitWithErrorSignalHandler) == SIG_ERR) {
-    FatalError("Failed to change signal handler");
-  }
-
   int wait_ret =
     HANDLE_EINTR(waitid(P_PID, child_pid, &reaped_child_info, WEXITED));