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

src/platform-cygwin.cc

Index: src/platform-cygwin.cc
diff --git a/src/platform-cygwin.cc b/src/platform-cygwin.cc
index f7e7d5e938ecdec842768585ef10c2a869318780..8914d636e5c4434dfa78f0f4bf8f758c397d5d50 100644
--- a/src/platform-cygwin.cc
+++ b/src/platform-cygwin.cc
@@ -776,21 +776,4 @@ void Sampler::Stop() {
 }
 
 
-bool Sampler::CanSampleOnProfilerEventsProcessorThread() {
-  return false;
-}
-
-
-void Sampler::DoSample() {
-}
-
-
-void Sampler::StartProfiling() {
-}
-
-
-void Sampler::StopProfiling() {
-}
-
-
 } }  // namespace v8::internal