Revert of Shrink initial old generation size based on new space survival rate.

src/heap/gc-tracer.h

Index: src/heap/gc-tracer.h
diff --git a/src/heap/gc-tracer.h b/src/heap/gc-tracer.h
index a2e4bc293eefc4366d500fcc81ea945c828a33b0..6932eadfd8d4ea4298bed4ff9d06c0c488b5759a 100644
--- a/src/heap/gc-tracer.h
+++ b/src/heap/gc-tracer.h
@@ -159,17 +159,6 @@
   };
 
 
-  class SurvivalEvent {
-   public:
-    // Default constructor leaves the event uninitialized.
-    SurvivalEvent() {}
-
-    explicit SurvivalEvent(double survival_rate);
-
-    double survival_rate_;
-  };
-
-
   class Event {
    public:
     enum Type {
@@ -278,8 +267,6 @@
   typedef RingBuffer<ContextDisposalEvent, kRingBufferMaxSize>
       ContextDisposalEventBuffer;
 
-  typedef RingBuffer<SurvivalEvent, kRingBufferMaxSize> SurvivalEventBuffer;
-
   explicit GCTracer(Heap* heap);
 
   // Start collecting data.
@@ -293,8 +280,6 @@
   void AddNewSpaceAllocationTime(double duration, intptr_t allocation_in_bytes);
 
   void AddContextDisposalTime(double time);
-
-  void AddSurvivalRate(double survival_rate);
 
   // Log an incremental marking step.
   void AddIncrementalMarkingStep(double duration, intptr_t bytes);
@@ -381,14 +366,6 @@
   // divides it by the number of recorded events.
   // Returns 0 if no events have been recorded.
   double ContextDisposalRateInMilliseconds() const;
-
-  // Computes the average survival rate based on the last recorded survival
-  // events.
-  // Returns 0 if no events have been recorded.
-  double AverageSurvivalRate() const;
-
-  // Returns true if at least one survival event was recorded.
-  bool SurvivalEventsRecorded() const;
 
  private:
   // Print one detailed trace line in name=value format.
@@ -440,11 +417,7 @@
   // RingBuffer for allocation events.
   AllocationEventBuffer allocation_events_;
 
-  // RingBuffer for context disposal events.
   ContextDisposalEventBuffer context_disposal_events_;
-
-  // RingBuffer for survival events.
-  SurvivalEventBuffer survival_events_;
 
   // Cumulative number of incremental marking steps since creation of tracer.
   int cumulative_incremental_marking_steps_;