Remove more uses of Isolate::current_zone.

runtime/vm/handles.cc

 // Copyright (c) 2012, 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/handles.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/dart_api_state.h"
 #include "vm/flags.h"
@@ skipping 58 matching lines @@
 
 
 bool VMHandles::IsZoneHandle(uword handle) {
   return Handles<kVMHandleSizeInWords,
                  kVMHandlesPerChunk,
                  kOffsetOfRawPtr >::IsZoneHandle(handle);
 }
 
 
 int VMHandles::ScopedHandleCount() {
-  Isolate* isolate = Isolate::Current();
-  ASSERT(isolate->current_zone() != NULL);
-  VMHandles* handles = isolate->current_zone()->handles();
+  Thread* thread = Thread::Current();
+  ASSERT(thread->zone() != NULL);
+  VMHandles* handles = thread->zone()->handles();
   return handles->CountScopedHandles();
 }
 
 
 int VMHandles::ZoneHandleCount() {
-  Isolate* isolate = Isolate::Current();
-  ASSERT(isolate->current_zone() != NULL);
-  VMHandles* handles = isolate->current_zone()->handles();
+  Thread* thread = Thread::Current();
+  ASSERT(thread->zone() != NULL);
+  VMHandles* handles = thread->zone()->handles();
   return handles->CountZoneHandles();
 }
 
 
 void HandleScope::Initialize() {
   ASSERT(thread()->no_handle_scope_depth() == 0);
   VMHandles* handles = thread()->zone()->handles();
   ASSERT(handles != NULL);
   saved_handle_block_ = handles->scoped_blocks_;
   saved_handle_slot_ = handles->scoped_blocks_->next_handle_slot();
@@ skipping 39 matching lines @@
   thread()->IncrementNoHandleScopeDepth();
 }
 
 
 NoHandleScope::~NoHandleScope() {
   thread()->DecrementNoHandleScopeDepth();
 }
 #endif  // defined(DEBUG)
 
 }  // namespace dart