Replace ENABLE(ASSERT) with DCHECK_IS_ON().

third_party/WebKit/Source/core/frame/LocalFrame.cpp

Index: third_party/WebKit/Source/core/frame/LocalFrame.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.cpp b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
index 1d711cb31da6bb8da232d4b21a31b29fb9ba14e7..33b0908078c8eef512c68d9e8eadec71cd79907c 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
@@ -179,17 +179,13 @@ class DraggedNodeImageBuilder {
   DraggedNodeImageBuilder(const LocalFrame& localFrame, Node& node)
       : m_localFrame(&localFrame),
         m_node(&node)
-#if ENABLE(ASSERT)
-        ,
-        m_domTreeVersion(node.document().domTreeVersion())
-#endif
   {
     for (Node& descendant : NodeTraversal::inclusiveDescendantsOf(*m_node))
       descendant.setDragged(true);
   }
 
   ~DraggedNodeImageBuilder() {
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
     DCHECK_EQ(m_domTreeVersion, m_node->document().domTreeVersion());
 #endif
     for (Node& descendant : NodeTraversal::inclusiveDescendantsOf(*m_node))
@@ -197,7 +193,7 @@ class DraggedNodeImageBuilder {
   }
 
   std::unique_ptr<DragImage> createImage() {
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
     DCHECK_EQ(m_domTreeVersion, m_node->document().domTreeVersion());
 #endif
     // Construct layout object for |m_node| with pseudo class "-webkit-drag"
@@ -236,8 +232,8 @@ class DraggedNodeImageBuilder {
  private:
   const Member<const LocalFrame> m_localFrame;
   const Member<Node> m_node;
-#if ENABLE(ASSERT)
-  const uint64_t m_domTreeVersion;
+#if DCHECK_IS_ON()
+  const uint64_t m_domTreeVersion = 0;

[Yuta Kitamura, 2017/01/19 08:50:02]

The original code initializes this to
|node.document().domTreeVersion()|, but the new code sets 0 here.
Is this OK?

[tkent, 2017/01/19 10:58:58]

It's my fault!  Thank you for finding it.

 #endif
 };