Remove the remaining parts of background idle notification.

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 4192 matching lines @@
     if (FLAG_trace_idle_notification_verbose) {
       PrintF("[");
       heap_state.Print();
       PrintF("]");
     }
     PrintF("\n");
   }
 }
 
 
-void Heap::CheckBackgroundIdleNotification(double idle_time_in_ms,
-                                           double now_ms) {
-  // TODO(ulan): Remove this function once Chrome uses new API
-  // for foreground/background notification.
-  if (idle_time_in_ms >= GCIdleTimeHandler::kMinBackgroundIdleTime) {
-    optimize_for_memory_usage_ = true;
-  } else {
-    optimize_for_memory_usage_ = false;
-  }
-}
-
-
 double Heap::MonotonicallyIncreasingTimeInMs() {
   return V8::GetCurrentPlatform()->MonotonicallyIncreasingTime() *
          static_cast<double>(base::Time::kMillisecondsPerSecond);
 }
 
 
 bool Heap::IdleNotification(int idle_time_in_ms) {
   return IdleNotification(
       V8::GetCurrentPlatform()->MonotonicallyIncreasingTime() +
       (static_cast<double>(idle_time_in_ms) /
        static_cast<double>(base::Time::kMillisecondsPerSecond)));
 }
 
 
 bool Heap::IdleNotification(double deadline_in_seconds) {
   CHECK(HasBeenSetUp());
   double deadline_in_ms =
       deadline_in_seconds *
       static_cast<double>(base::Time::kMillisecondsPerSecond);
   HistogramTimerScope idle_notification_scope(
       isolate_->counters()->gc_idle_notification());
   double start_ms = MonotonicallyIncreasingTimeInMs();
   double idle_time_in_ms = deadline_in_ms - start_ms;
 
-  CheckBackgroundIdleNotification(idle_time_in_ms, start_ms);
-
   tracer()->SampleAllocation(start_ms, NewSpaceAllocationCounter(),
                              OldGenerationAllocationCounter());
 
   GCIdleTimeHeapState heap_state = ComputeHeapState();
 
   GCIdleTimeAction action =
       gc_idle_time_handler_->Compute(idle_time_in_ms, heap_state);
 
   bool result = PerformIdleTimeAction(action, heap_state, deadline_in_ms);
 
@@ skipping 1925 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8