Removed RuntimeProfilerRateLimiter class and RuntimeProfiler::IsSomeIsolateInJS.

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 7a186413b5f3c7c059fd9e09f50abd7490dbedbf..8022ba2d5af110ab24f155872736ed3d9a6b5f9d 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -1153,7 +1153,7 @@ class SignalSender : public Thread {
         SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this);
       } else {
         if (signal_handler_installed_) RestoreSignalHandler();
-        if (rate_limiter_.SuspendIfNecessary()) continue;
+        if (RuntimeProfiler::WaitForSomeIsolateToEnterJS()) continue;
       }
       Sleep();  // TODO(svenpanne) Figure out if OS:Sleep(interval_) is enough.
     }
@@ -1198,7 +1198,6 @@ class SignalSender : public Thread {
 
   const int vm_tgid_;
   const int interval_;
-  RuntimeProfilerRateLimiter rate_limiter_;
 
   // Protects the process wide state below.
   static Mutex* mutex_;