Allow assertions to be enabled in Blink Release builds.

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index d3a94fee9fb2b4a9c824c8a062ce5d5b8866ac74..afbb32eed64c1b0708f133e64a3936846e1c4dd2 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -1012,7 +1012,7 @@ void RenderBlock::makeChildrenNonInline(RenderObject *insertionPoint)
         moveChildrenTo(block, inlineRunStart, child);
     }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     for (RenderObject *c = firstChild(); c; c = c->nextSibling())
         ASSERT(!c->isInline());
 #endif
@@ -4916,7 +4916,7 @@ bool RenderBlock::recalcOverflowAfterStyleChange()
     return !hasOverflowClip();
 }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
 void RenderBlock::checkPositionedObjectsNeedLayout()
 {
     if (!gPositionedDescendantsMap)
@@ -4931,6 +4931,10 @@ void RenderBlock::checkPositionedObjectsNeedLayout()
     }
 }
 
+#endif
+
+#ifndef NDEBUG
+
 void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
 {
     showRenderObject();