Revert "Signal handling."

runtime/bin/signal_blocker.h

Index: runtime/bin/signal_blocker.h
diff --git a/runtime/bin/signal_blocker.h b/runtime/bin/signal_blocker.h
index 1ab816c145deda0af496c680557b4b146199b433..58e8d7eb00bdf5dfb568efcd6f5d9f9a5fbb7b61 100644
--- a/runtime/bin/signal_blocker.h
+++ b/runtime/bin/signal_blocker.h
@@ -26,26 +26,12 @@ class ThreadSignalBlocker {
     sigaddset(&signal_mask, sig);
     // Add sig to signal mask.
     int r = pthread_sigmask(SIG_BLOCK, &signal_mask, &old);
-    USE(r);
-    ASSERT(r == 0);
-  }
-
-  ThreadSignalBlocker(int sigs_count, const int sigs[]) {
-    sigset_t signal_mask;
-    sigemptyset(&signal_mask);
-    for (int i = 0; i < sigs_count; i++) {
-      sigaddset(&signal_mask, sigs[i]);
-    }
-    // Add sig to signal mask.
-    int r = pthread_sigmask(SIG_BLOCK, &signal_mask, &old);
-    USE(r);
     ASSERT(r == 0);
   }
 
   ~ThreadSignalBlocker() {
     // Restore signal mask.
     int r = pthread_sigmask(SIG_SETMASK, &old, NULL);
-    USE(r);
     ASSERT(r == 0);
   }