[heap] Remove unused step_size_in_bytes in AdvanceIncrementalMarking.

src/heap/incremental-marking.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_INCREMENTAL_MARKING_H_
 #define V8_HEAP_INCREMENTAL_MARKING_H_
 
 #include "src/cancelable-task.h"
 #include "src/execution.h"
 #include "src/heap/heap.h"
@@ skipping 88 matching lines @@
   void Finalize();
 
   void Stop();
 
   void FinalizeMarking(CompletionAction action);
 
   void MarkingComplete(CompletionAction action);
 
   void Epilogue();
 
-  // Performs incremental marking steps of step_size_in_bytes as long as
-  // deadline_in_ms is not reached. step_size_in_bytes can be 0 to compute
-  // an estimate increment. Returns the remaining time that cannot be used
-  // for incremental marking anymore because a single step would exceed the
-  // deadline.
-  double AdvanceIncrementalMarking(intptr_t step_size_in_bytes,
-                                   double deadline_in_ms,
+  // Performs incremental marking steps until deadline_in_ms is reached. It
+  // returns the remaining time that cannot be used for incremental marking
+  // anymore because a single step would exceed the deadline.
+  double AdvanceIncrementalMarking(double deadline_in_ms,
                                    StepActions step_actions);
 
   // It's hard to know how much work the incremental marker should do to make
   // progress in the face of the mutator creating new work for it.  We start
   // of at a moderate rate of work and gradually increase the speed of the
   // incremental marker until it completes.
   // Do some marking every time this much memory has been allocated or that many
   // heavy (color-checking) write barriers have been invoked.
   static const intptr_t kAllocatedThreshold = 65536;
   static const intptr_t kWriteBarriersInvokedThreshold = 32768;
@@ skipping 174 matching lines @@
   GCRequestType request_type_;
 
   IncrementalMarkingJob incremental_marking_job_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_INCREMENTAL_MARKING_H_