[Isolates] ScavengeVisitor gets member Heap*.

src/scanner.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 398 matching lines @@
   Scan();
 }
 
 
 Token::Value Scanner::Next() {
   // BUG 1215673: Find a thread safe way to set a stack limit in
   // pre-parse mode. Otherwise, we cannot safely pre-parse from other
   // threads.
   current_ = next_;
   // Check for stack-overflow before returning any tokens.
-  StackLimitCheck check;
+  StackLimitCheck check(Isolate::Current());
   if (check.HasOverflowed()) {
     stack_overflow_ = true;
     next_.token = Token::ILLEGAL;
   } else {
     has_line_terminator_before_next_ = false;
     Scan();
   }
   return current_.token;
 }
 
@@ skipping 918 matching lines @@
     }
     AddCharAdvance();
   }
   literal.Complete();
 
   next_.location.end_pos = source_pos() - 1;
   return true;
 }
 
 } }  // namespace v8::internal