Remove isolate arg from EmbedderHeapTracer methods.

include/v8.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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 5395 matching lines @@
  */
 enum class MemoryPressureLevel { kNone, kModerate, kCritical };
 
 /**
  * Interface for tracing through the embedder heap. During the v8 garbage
  * collection, v8 collects hidden fields of all potential wrappers, and at the
  * end of its marking phase iterates the collection and asks the embedder to
  * trace through its heap and call PersistentBase::RegisterExternalReference on
  * each js object reachable from any of the given wrappers.
  *
- * Before the first call to the TraceWrappersFrom function v8 will call
- * TracePrologue. When the v8 garbage collection is finished, v8 will call
- * TraceEpilogue.
+ * Before the first call to the TraceWrappersFrom function TracePrologue will be
+ * called. When the garbage collection cycle is finished, TraceEpilogue will be
+ * called.
  */
 class EmbedderHeapTracer {
  public:
   /**
    * V8 will call this method at the beginning of the gc cycle.
    */
-  virtual void TracePrologue(Isolate* isolate) = 0;
-
+  virtual void TracePrologue() = 0;
   /**
    * V8 will call this method with internal fields of a potential wrappers.
    * Embedder is expected to trace its heap (synchronously) and call
    * PersistentBase::RegisterExternalReference() on all wrappers reachable from
    * any of the given wrappers.
    */
   virtual void TraceWrappersFrom(
-      Isolate* isolate,
       const std::vector<std::pair<void*, void*> >& internal_fields) = 0;
   /**
    * V8 will call this method at the end of the gc cycle. Allocation is *not*
    * allowed in the TraceEpilogue.
    */
-  virtual void TraceEpilogue(Isolate* isolate) = 0;
+  virtual void TraceEpilogue() = 0;
 
  protected:
   virtual ~EmbedderHeapTracer() = default;
 };
 
 /**
  * Isolate represents an isolated instance of the V8 engine.  V8 isolates have
  * completely separate states.  Objects from one isolate must not be used in
  * other isolates.  The embedder can create multiple isolates and use them in
  * parallel in multiple threads.  An isolate can be entered by at most one
@@ skipping 3322 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_