[heap] Remove TryFinalizeIdleIncrementalMarking.

src/heap/heap.h

 // 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.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 1239 matching lines @@
   void StartIncrementalMarking(
       int gc_flags, GarbageCollectionReason gc_reason,
       GCCallbackFlags gc_callback_flags = GCCallbackFlags::kNoGCCallbackFlags);
 
   void StartIncrementalMarkingIfAllocationLimitIsReached(
       int gc_flags,
       GCCallbackFlags gc_callback_flags = GCCallbackFlags::kNoGCCallbackFlags);
 
   void FinalizeIncrementalMarkingIfComplete(GarbageCollectionReason gc_reason);
 
-  bool TryFinalizeIdleIncrementalMarking(double idle_time_in_ms,
-                                         GarbageCollectionReason gc_reason);
-
   void RegisterReservationsForBlackAllocation(Reservation* reservations);
 
   IncrementalMarking* incremental_marking() { return incremental_marking_; }
 
   // ===========================================================================
   // Concurrent marking API. ===================================================
   // ===========================================================================
 
   ConcurrentMarking* concurrent_marking() { return concurrent_marking_; }
 
@@ skipping 1386 matching lines @@
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 V8_EXPORT_PRIVATE const char* AllocationSpaceName(AllocationSpace space);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_