Oilpan: Don't use guard pages in NaCl

Source/platform/heap/Heap.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1668 matching lines @@
             ++(classAgeCounts.add(className, AgeCounts()).storedValue->value.ages[header->age()]);
         }
     }
 }
 #endif
 
 #if ENABLE(ASSERT) || ENABLE(GC_PROFILING)
 bool NormalPage::contains(Address addr)
 {
     Address blinkPageStart = roundToBlinkPageStart(address());
-    ASSERT(blinkPageStart == address() - WTF::kSystemPageSize); // Page is at aligned address plus guard page size.
+    ASSERT(blinkPageStart == address() - blinkGuardPageSize); // Page is at aligned address plus guard page size.
     return blinkPageStart <= addr && addr < blinkPageStart + blinkPageSize;
 }
 #endif
 
 NormalPageHeap* NormalPage::heapForNormalPage()
 {
     return static_cast<NormalPageHeap*>(heap());
 }
 
 LargeObjectPage::LargeObjectPage(PageMemory* storage, BaseHeap* heap, size_t payloadSize)
@@ skipping 848 matching lines @@
 size_t Heap::s_objectSizeAtLastGC = 0;
 size_t Heap::s_markedObjectSize = 0;
 size_t Heap::s_persistentCount = 0;
 size_t Heap::s_persistentCountAtLastGC = 0;
 size_t Heap::s_collectedPersistentCount = 0;
 size_t Heap::s_partitionAllocSizeAtLastGC = 0;
 size_t Heap::s_heapSizePerPersistent = 0;
 double Heap::s_estimatedMarkingTimePerByte = 0.0;
 
 } // namespace blink