Revert "Send SIGPROF signals on the profiler event processor thread"

src/platform-nullos.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 507 matching lines @@
 void ProfileSampler::Start() {
   UNIMPLEMENTED();
 }
 
 
 void ProfileSampler::Stop() {
   UNIMPLEMENTED();
 }
 
 
-bool Sampler::CanSampleOnProfilerEventsProcessorThread() {
-  UNIMPLEMENTED();
-  return false;
-}
-
-
-void Sampler::DoSample() {
-  UNIMPLEMENTED();
-}
-
-
-void Sampler::StartProfiling() {
-  UNIMPLEMENTED();
-}
-
-
-void Sampler::StopProfiling() {
-  UNIMPLEMENTED();
-}
-
-
 } }  // namespace v8::internal