[heap] Remove unused step_size_in_bytes in AdvanceIncrementalMarking.

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/ast/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 910 matching lines @@
                         kGCCallbackFlagSynchronousPhantomCallbackProcessing);
     }
   } else {
     // Incremental marking is turned on an has already been started.
 
     // TODO(mlippautz): Compute the time slice for incremental marking based on
     // memory pressure.
     double deadline = MonotonicallyIncreasingTimeInMs() +
                       FLAG_external_allocation_limit_incremental_time;
     incremental_marking()->AdvanceIncrementalMarking(
-        0, deadline,
+        deadline,
         IncrementalMarking::StepActions(IncrementalMarking::GC_VIA_STACK_GUARD,
                                         IncrementalMarking::FORCE_MARKING,
                                         IncrementalMarking::FORCE_COMPLETION));
   }
 }
 
 
 void Heap::EnsureFillerObjectAtTop() {
   // There may be an allocation memento behind every object in new space.
   // If we evacuate a not full new space or if we are on the last page of
@@ skipping 5534 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8