Allow assertions to be enabled in Blink Release builds.

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index 8484efb036a2c895e22da75f4cb0d693129da03f..25b977cc5d9cc2d21dde8c20e2cd6e6206abf6a8 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -137,7 +137,7 @@ Page::Page(PageClients& pageClients)
     , m_timerAlignmentInterval(DOMTimer::visiblePageAlignmentInterval())
     , m_visibilityState(PageVisibilityStateVisible)
     , m_isCursorVisible(true)
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     , m_isPainting(false)
 #endif
     , m_frameHost(FrameHost::create(*this))
@@ -432,7 +432,7 @@ double Page::timerAlignmentInterval() const
     return m_timerAlignmentInterval;
 }
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
 void Page::checkSubframeCountConsistency() const
 {
     ASSERT(m_subframeCount >= 0);