Replace ASSERTs in platform/heap/ with DCHECKs

third_party/WebKit/Source/platform/heap/MarkingVisitor.h

Index: third_party/WebKit/Source/platform/heap/MarkingVisitor.h
diff --git a/third_party/WebKit/Source/platform/heap/MarkingVisitor.h b/third_party/WebKit/Source/platform/heap/MarkingVisitor.h
index 9416e4dd127ae7cd964b31ca71a4b429f00024e1..b3d758d4b23e6afce5fb2a6b3e82890889224d08 100644
--- a/third_party/WebKit/Source/platform/heap/MarkingVisitor.h
+++ b/third_party/WebKit/Source/platform/heap/MarkingVisitor.h
@@ -42,7 +42,7 @@ class MarkingVisitor final : public Visitor,
     Impl::registerWeakTable(closure, iterationCallback, iterationDoneCallback);
   }
 
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
   virtual bool weakTableRegistered(const void* closure) {
     return Impl::weakTableRegistered(closure);
   }
@@ -73,7 +73,7 @@ class MarkingVisitor final : public Visitor,
       return true;
 
     BasePage* page = pageFromObject(objectPointer);
-    ASSERT(!page->orphaned());
+    DCHECK(!page->orphaned());
     // When doing a thread local GC, the marker checks if
     // the object resides in another thread's heap. If it
     // does, the object should not be marked & traced.