Compile under-invalidation checking in all builds

third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h

Index: third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h b/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
index 0cc8cf31997441ee3289b0ae76d1314c6df377de..8b30934f08666cc213feb96694f739a601755e43 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h
@@ -303,6 +303,8 @@ public:
 
 #if DCHECK_IS_ON()
     virtual bool isEndAndPairedWith(DisplayItem::Type otherType) const { return false; }
+#endif
+
     virtual bool equals(const DisplayItem& other) const
     {
         return m_client == other.m_client
@@ -310,7 +312,6 @@ public:
             && m_derivedSize == other.m_derivedSize
             && m_skippedCache == other.m_skippedCache;
     }
-#endif
 
     // True if the client is non-null. Because m_client is const, this should
     // never be false except when we explicitly create a tombstone/"dead display