Replace ASSERT_NOT_REACHED with NOTREACHED in core/page

third_party/WebKit/Source/core/page/scrolling/ScrollStateCallback.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/page/scrolling/ScrollStateCallback.h"
 
 #include "platform/wtf/text/WTFString.h"
 
 namespace blink {
 
 WebNativeScrollBehavior ScrollStateCallback::ToNativeScrollBehavior(
     String native_scroll_behavior) {
   static const char kDisable[] = "disable-native-scroll";
   static const char kBefore[] = "perform-before-native-scroll";
   static const char kAfter[] = "perform-after-native-scroll";
 
   if (native_scroll_behavior == kDisable)
     return WebNativeScrollBehavior::kDisableNativeScroll;
   if (native_scroll_behavior == kBefore)
     return WebNativeScrollBehavior::kPerformBeforeNativeScroll;
   if (native_scroll_behavior == kAfter)
     return WebNativeScrollBehavior::kPerformAfterNativeScroll;
 
-  ASSERT_NOT_REACHED();
+  NOTREACHED();
   return WebNativeScrollBehavior::kDisableNativeScroll;
 }
 
 }  // namespace blink