Oilpan: Replace checkHeader() with ASSERT(checkHeader())

Source/platform/heap/HeapAllocator.cpp

Index: Source/platform/heap/HeapAllocator.cpp
diff --git a/Source/platform/heap/HeapAllocator.cpp b/Source/platform/heap/HeapAllocator.cpp
index e5c95718768dc4e969897e640c90217dfb50f0f4..a5299d339b1feda34b4efc8ab4562e25726f1040 100644
--- a/Source/platform/heap/HeapAllocator.cpp
+++ b/Source/platform/heap/HeapAllocator.cpp
@@ -24,7 +24,7 @@ void HeapAllocator::backingFree(void* address)
         return;
 
     HeapObjectHeader* header = HeapObjectHeader::fromPayload(address);
-    header->checkHeader();
+    ASSERT(header->checkHeader());
     NormalPageHeap* heap = static_cast<NormalPage*>(page)->heapForNormalPage();
     state->promptlyFreed(header->gcInfoIndex());
     heap->promptlyFreeObject(header);
@@ -63,7 +63,7 @@ bool HeapAllocator::backingExpand(void* address, size_t newSize)
         return false;
 
     HeapObjectHeader* header = HeapObjectHeader::fromPayload(address);
-    header->checkHeader();
+    ASSERT(header->checkHeader());
     NormalPageHeap* heap = static_cast<NormalPage*>(page)->heapForNormalPage();
     bool succeed = heap->expandObject(header, newSize);
     if (succeed)
@@ -110,7 +110,7 @@ void HeapAllocator::backingShrink(void* address, size_t quantizedCurrentSize, si
         return;
 
     HeapObjectHeader* header = HeapObjectHeader::fromPayload(address);
-    header->checkHeader();
+    ASSERT(header->checkHeader());
     NormalPageHeap* heap = static_cast<NormalPage*>(page)->heapForNormalPage();
     bool succeed = heap->shrinkObject(header, quantizedShrunkSize);
     if (succeed)