Remove unnecessary isolate argument from some visitors

runtime/vm/disassembler.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/disassembler.h"
 
 #include "vm/assembler.h"
 #include "vm/deopt_instructions.h"
 #include "vm/globals.h"
 #include "vm/il_printer.h"
@@ skipping 81 matching lines @@
   jsarr_.AddValueNull();
   jsarr_.AddValueNull();
   jsarr_.AddValue(p);
   jsarr_.AddValueNull();
   free(p);
 }
 
 
 class FindAddrVisitor : public FindObjectVisitor {
  public:
-  explicit FindAddrVisitor(uword addr)
-      : FindObjectVisitor(Isolate::Current()), addr_(addr) { }
+  explicit FindAddrVisitor(uword addr) : addr_(addr) { }
   virtual ~FindAddrVisitor() { }
 
   virtual uword filter_addr() const { return addr_; }
 
   // Check if object matches find condition.
   virtual bool FindObject(RawObject* obj) const {
     return obj == reinterpret_cast<RawObject*>(addr_);
   }
 
  private:
@@ skipping 211 matching lines @@
     THR_Print("}\n");
   }
   if (optimized && FLAG_trace_inlining_intervals) {
     code.DumpInlinedIntervals();
   }
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart