Use DCHECK instead of ASSERT in DataConsumerHandle-related stuff

third_party/WebKit/Source/modules/fetch/CompositeDataConsumerHandle.h

Index: third_party/WebKit/Source/modules/fetch/CompositeDataConsumerHandle.h
diff --git a/third_party/WebKit/Source/modules/fetch/CompositeDataConsumerHandle.h b/third_party/WebKit/Source/modules/fetch/CompositeDataConsumerHandle.h
index e2a95d2d87bb10a4d4e41d5b106daea6b406b34a..90f33cf3dc6ecfce5aa33cdd58600a34f0279165 100644
--- a/third_party/WebKit/Source/modules/fetch/CompositeDataConsumerHandle.h
+++ b/third_party/WebKit/Source/modules/fetch/CompositeDataConsumerHandle.h
@@ -37,7 +37,7 @@ public:
 
     private:
         RefPtr<Context> m_context;
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
         WebThread* const m_thread;
 #endif
     };
@@ -48,7 +48,7 @@ public:
     template<typename T>
     static std::unique_ptr<WebDataConsumerHandle> create(std::unique_ptr<WebDataConsumerHandle> handle, T* updater)
     {
-        ASSERT(handle);
+        DCHECK(handle);
         Updater* u = nullptr;
         std::unique_ptr<CompositeDataConsumerHandle> p = wrapUnique(new CompositeDataConsumerHandle(std::move(handle), &u));
         *updater = u;