Remove unnecessary isolate argument from some visitors

runtime/vm/service.cc

 // Copyright (c) 2013, 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/service.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/globals.h"
 
@@ skipping 3385 matching lines @@
   extension_event.event_kind = &event_kind;
   extension_event.event_data = &event_data;
   ServiceEvent event(isolate, ServiceEvent::kExtension);
   event.set_extension_event(extension_event);
   Service::HandleEvent(&event);
 }
 
 
 class ContainsAddressVisitor : public FindObjectVisitor {
  public:
-  ContainsAddressVisitor(Isolate* isolate, uword addr)
-      : FindObjectVisitor(isolate), addr_(addr) { }
+  explicit ContainsAddressVisitor(uword addr) : addr_(addr) { }
   virtual ~ContainsAddressVisitor() { }
 
   virtual uword filter_addr() const { return addr_; }
 
   virtual bool FindObject(RawObject* obj) const {
     // Free list elements are not real objects, so skip them.
     if (obj->IsFreeListElement()) {
       return false;
     }
     uword obj_begin = RawObject::ToAddr(obj);
@@ skipping 10 matching lines @@
   NULL,
 };
 
 
 static RawObject* GetObjectHelper(Thread* thread, uword addr) {
   Object& object = Object::Handle(thread->zone());
 
   {
     NoSafepointScope no_safepoint;
     Isolate* isolate = thread->isolate();
-    ContainsAddressVisitor visitor(isolate, addr);
+    ContainsAddressVisitor visitor(addr);
     object = isolate->heap()->FindObject(&visitor);
   }
 
   if (!object.IsNull()) {
     return object.raw();
   }
 
   {
     NoSafepointScope no_safepoint;
-    ContainsAddressVisitor visitor(Dart::vm_isolate(), addr);
+    ContainsAddressVisitor visitor(addr);
     object = Dart::vm_isolate()->heap()->FindObject(&visitor);
   }
 
   return object.raw();
 }
 
 
 static bool GetObjectByAddress(Thread* thread, JSONStream* js) {
   const char* addr_str = js->LookupParam("address");
   if (addr_str == NULL) {
@@ skipping 648 matching lines @@
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart