Migrate most uses of Isolate::current_zone to Thread::zone.

runtime/vm/growable_array.h

 // 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.
 // Defines growable array classes, that differ where they are allocated:
 // - GrowableArray: allocated on stack.
 // - ZoneGrowableArray: allocated in the zone.
 // - MallocGrowableArray: allocates using malloc/realloc; free is only called
 //   at destruction.
 
 #ifndef VM_GROWABLE_ARRAY_H_
@@ skipping 143 matching lines @@
 
 template<typename T>
 class GrowableArray : public BaseGrowableArray<T, ValueObject> {
  public:
   GrowableArray(Zone* zone, intptr_t initial_capacity)
       : BaseGrowableArray<T, ValueObject>(
           initial_capacity, ASSERT_NOTNULL(zone)) {}
   explicit GrowableArray(intptr_t initial_capacity)
       : BaseGrowableArray<T, ValueObject>(
           initial_capacity,
-          ASSERT_NOTNULL(Isolate::Current()->current_zone())) {}
+          ASSERT_NOTNULL(Thread::Current()->zone())) {}
   GrowableArray()
       : BaseGrowableArray<T, ValueObject>(
-          ASSERT_NOTNULL(Isolate::Current()->current_zone())) {}
+          ASSERT_NOTNULL(Thread::Current()->zone())) {}
 };
 
 
 template<typename T>
 class ZoneGrowableArray : public BaseGrowableArray<T, ZoneAllocated> {
  public:
   ZoneGrowableArray(Zone* zone, intptr_t initial_capacity)
       : BaseGrowableArray<T, ZoneAllocated>(
           initial_capacity, ASSERT_NOTNULL(zone)) {}
   explicit ZoneGrowableArray(intptr_t initial_capacity)
       : BaseGrowableArray<T, ZoneAllocated>(
           initial_capacity,
-          ASSERT_NOTNULL(Isolate::Current()->current_zone())) {}
+          ASSERT_NOTNULL(Thread::Current()->zone())) {}
   ZoneGrowableArray()
       : BaseGrowableArray<T, ZoneAllocated>(
-          ASSERT_NOTNULL(Isolate::Current()->current_zone())) {}
+          ASSERT_NOTNULL(Thread::Current()->zone())) {}
 };
 
 
 class Malloc : public AllStatic {
  public:
   template <class T>
   static inline T* Alloc(intptr_t len) {
     return reinterpret_cast<T*>(malloc(len * sizeof(T)));
   }
 
@@ skipping 17 matching lines @@
  public:
   explicit MallocGrowableArray(intptr_t initial_capacity)
       : BaseGrowableArray<T, EmptyBase, Malloc>(initial_capacity, NULL) {}
   MallocGrowableArray()
       : BaseGrowableArray<T, EmptyBase, Malloc>(NULL) {}
 };
 
 }  // namespace dart
 
 #endif  // VM_GROWABLE_ARRAY_H_