Revert 266968 "NonSFI NaCl: Plumb Exception IRT enough for break..."

trunk/src/components/nacl/loader/nacl_helper_linux.cc

Index: trunk/src/components/nacl/loader/nacl_helper_linux.cc
===================================================================
--- trunk/src/components/nacl/loader/nacl_helper_linux.cc	(revision 266986)
+++ trunk/src/components/nacl/loader/nacl_helper_linux.cc	(working copy)
@@ -32,7 +32,6 @@
 #include "base/rand_util.h"
 #include "components/nacl/common/nacl_switches.h"
 #include "components/nacl/loader/nacl_listener.h"
-#include "components/nacl/loader/nonsfi/irt_exception_handling.h"
 #include "components/nacl/loader/sandbox_linux/nacl_sandbox_linux.h"
 #include "content/public/common/content_descriptors.h"
 #include "content/public/common/zygote_fork_delegate_linux.h"
@@ -83,9 +82,6 @@
         base::GlobalDescriptors::kBaseDescriptor + kSandboxIPCChannel;
 
     ReplaceFDWithDummy(sandbox_ipc_channel);
-
-    // Install crash signal handlers before disallowing system calls.
-    nacl::nonsfi::InitializeSignalHandler();
   }
 
   // Finish layer-1 sandbox initialization and initialize the layer-2 sandbox.