Allow assertions to be enabled in Blink Release builds.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 601792e84557023048ea8e986e1d36f1fa1bbb7b..42672135abc979719061d63d3cb00a56807f6f2b 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -277,9 +277,6 @@ public:
     const ViewportDescription& viewportDescription() const { return m_viewportDescription; }
     Length viewportDefaultMinWidth() const { return m_viewportDefaultMinWidth; }
 
-#ifndef NDEBUG
-    bool didDispatchViewportPropertiesChanged() const { return m_didDispatchViewportPropertiesChanged; }
-#endif
     bool hasLegacyViewportTag() const { return m_legacyViewportDescription.isLegacyViewportType(); }
 
     void setReferrerPolicy(ReferrerPolicy);
@@ -1362,10 +1359,6 @@ private:
 
     OwnPtrWillBeMember<ElementDataCache> m_elementDataCache;
 
-#ifndef NDEBUG
-    bool m_didDispatchViewportPropertiesChanged;
-#endif
-
     typedef HashMap<AtomicString, OwnPtr<Locale> > LocaleIdentifierToLocaleMap;
     LocaleIdentifierToLocaleMap m_localeCache;