Reverts CLs related to the TLAB due to heap exhaustion.

runtime/vm/heap.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.
 
 #ifndef RUNTIME_VM_HEAP_H_
 #define RUNTIME_VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 233 matching lines @@
 
   Isolate* isolate() const { return isolate_; }
 
   Monitor* barrier() const { return barrier_; }
   Monitor* barrier_done() const { return barrier_done_; }
 
   void SetupImagePage(void* pointer, uword size, bool is_executable) {
     old_space_.SetupImagePage(pointer, size, is_executable);
   }
 
-  intptr_t CalculateTLABSize();
-  void FillRemainingTLAB(Thread* thread);
-  void AbandonRemainingTLAB(Thread* thread);
-
  private:
   class GCStats : public ValueObject {
    public:
     GCStats() {}
     intptr_t num_;
     Heap::Space space_;
     Heap::GCReason reason_;
 
     class Data : public ValueObject {
      public:
@@ skipping 139 matching lines @@
 // Note: During this scope, the code pages are non-executable.
 class WritableVMIsolateScope : StackResource {
  public:
   explicit WritableVMIsolateScope(Thread* thread);
   ~WritableVMIsolateScope();
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_HEAP_H_