Replace ASSERT with DCHECK in modules/fetch.

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

Index: third_party/WebKit/Source/modules/fetch/DataConsumerHandleTestUtil.h
diff --git a/third_party/WebKit/Source/modules/fetch/DataConsumerHandleTestUtil.h b/third_party/WebKit/Source/modules/fetch/DataConsumerHandleTestUtil.h
index 38ccd5a069fc330876e700205e2614ad5dd846b3..663a1f8c1b16cc1b1795b82d8804eb4dafd5db03 100644
--- a/third_party/WebKit/Source/modules/fetch/DataConsumerHandleTestUtil.h
+++ b/third_party/WebKit/Source/modules/fetch/DataConsumerHandleTestUtil.h
@@ -111,24 +111,24 @@ class DataConsumerHandleTestUtil {
 
       void registerThreadHolder(ThreadHolder* holder) {
         MutexLocker locker(m_holderMutex);
-        ASSERT(!m_holder);
+        DCHECK(!m_holder);
         m_holder = holder;
       }
       void unregisterThreadHolder() {
         MutexLocker locker(m_holderMutex);
-        ASSERT(m_holder);
+        DCHECK(m_holder);
         m_holder = nullptr;
       }
       void postTaskToReadingThread(const WebTraceLocation& location,
                                    std::unique_ptr<CrossThreadClosure> task) {
         MutexLocker locker(m_holderMutex);
-        ASSERT(m_holder);
+        DCHECK(m_holder);
         m_holder->readingThread()->postTask(location, std::move(task));
       }
       void postTaskToUpdatingThread(const WebTraceLocation& location,
                                     std::unique_ptr<CrossThreadClosure> task) {
         MutexLocker locker(m_holderMutex);
-        ASSERT(m_holder);
+        DCHECK(m_holder);
         m_holder->updatingThread()->postTask(location, std::move(task));
       }