Migrate stack resource unwinding to Thread.

runtime/vm/log.cc

 // Copyright (c) 2015, 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/log.h"
 
 #include "vm/flags.h"
 #include "vm/thread.h"
 
 namespace dart {
@@ skipping 100 matching lines @@
 void Log::DisableManualFlush() {
   manual_flush_--;
   ASSERT(manual_flush_ >= 0);
   if (manual_flush_ == 0) {
     Flush();
   }
 }
 
 
 LogBlock::LogBlock(Thread* thread, Log* log)
-    : StackResource(thread->isolate()),
+    : StackResource(thread),
       log_(log), cursor_(log->cursor()) {
   CommonConstructor();
 }
 
 
 LogBlock::LogBlock(Isolate* isolate)
     : StackResource(isolate),
       log_(isolate->Log()), cursor_(isolate->Log()->cursor()) {
   CommonConstructor();
 }
 
 
 LogBlock::LogBlock(Thread* thread)
-    : StackResource(thread->isolate()),
+    : StackResource(thread),
       log_(thread->isolate()->Log()),
       cursor_(thread->isolate()->Log()->cursor()) {
   CommonConstructor();
 }
 
 }  // namespace dart