Make HeapObjectHeader::checkHeader private.

third_party/WebKit/Source/platform/heap/HeapAllocator.cpp

Index: third_party/WebKit/Source/platform/heap/HeapAllocator.cpp
diff --git a/third_party/WebKit/Source/platform/heap/HeapAllocator.cpp b/third_party/WebKit/Source/platform/heap/HeapAllocator.cpp
index f8375d619dd0c8f7c9b6d2556a06499ca2f9ca27..2db2d4e6187dddb89082a8be6c97004c69b1dc7f 100644
--- a/third_party/WebKit/Source/platform/heap/HeapAllocator.cpp
+++ b/third_party/WebKit/Source/platform/heap/HeapAllocator.cpp
@@ -22,7 +22,6 @@ void HeapAllocator::backingFree(void* address) {
     return;
 
   HeapObjectHeader* header = HeapObjectHeader::fromPayload(address);
-  header->checkHeader();
   NormalPageArena* arena = static_cast<NormalPage*>(page)->arenaForNormalPage();
   state->promptlyFreed(header->gcInfoIndex());
   arena->promptlyFreeObject(header);
@@ -58,7 +57,6 @@ bool HeapAllocator::backingExpand(void* address, size_t newSize) {
     return false;
 
   HeapObjectHeader* header = HeapObjectHeader::fromPayload(address);
-  header->checkHeader();
   NormalPageArena* arena = static_cast<NormalPage*>(page)->arenaForNormalPage();
   bool succeed = arena->expandObject(header, newSize);
   if (succeed)
@@ -100,7 +98,6 @@ bool HeapAllocator::backingShrink(void* address,
     return false;
 
   HeapObjectHeader* header = HeapObjectHeader::fromPayload(address);
-  header->checkHeader();
   NormalPageArena* arena = static_cast<NormalPage*>(page)->arenaForNormalPage();
   // We shrink the object only if the shrinking will make a non-small
   // prompt-free block.