Rename ASSERT* to DCHECK*.

src/conversions.h

Index: src/conversions.h
diff --git a/src/conversions.h b/src/conversions.h
index 5a9f470242baba63b34ab4046eebfaf6d2d67a21..c33de77cd1f45f83f3197557a03aaab6f7f84a40 100644
--- a/src/conversions.h
+++ b/src/conversions.h
@@ -199,7 +199,7 @@ inline bool TryNumberToSize(Isolate* isolate,
   SealHandleScope shs(isolate);
   if (number->IsSmi()) {
     int value = Smi::cast(number)->value();
-    ASSERT(static_cast<unsigned>(Smi::kMaxValue)
+    DCHECK(static_cast<unsigned>(Smi::kMaxValue)
            <= std::numeric_limits<size_t>::max());
     if (value >= 0) {
       *result = static_cast<size_t>(value);
@@ -207,7 +207,7 @@ inline bool TryNumberToSize(Isolate* isolate,
     }
     return false;
   } else {
-    ASSERT(number->IsHeapNumber());
+    DCHECK(number->IsHeapNumber());
     double value = HeapNumber::cast(number)->value();
     if (value >= 0 &&
         value <= std::numeric_limits<size_t>::max()) {