Replace tests of ASSERT_ENABLED with ENABLE(ASSERT).

Source/core/rendering/ClipRectsCache.h

Index: Source/core/rendering/ClipRectsCache.h
diff --git a/Source/core/rendering/ClipRectsCache.h b/Source/core/rendering/ClipRectsCache.h
index 457bc1f55893f043eff5e64a9a7b591db4e7aa7c..e2ba9611910a076d85e0ecc839d09888330991da 100644
--- a/Source/core/rendering/ClipRectsCache.h
+++ b/Source/core/rendering/ClipRectsCache.h
@@ -7,7 +7,7 @@
 
 #include "core/rendering/ClipRects.h"
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
 #include "core/rendering/RenderBox.h" // For OverlayScrollbarSizeRelevancy.
 #endif
 
@@ -34,7 +34,7 @@ public:
     struct Entry {
         Entry()
             : root(0)
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
             , scrollbarRelevancy(IgnoreOverlayScrollbarSize)
 #endif
         {
@@ -42,7 +42,7 @@ public:
 
         const RenderLayer* root;
         RefPtr<ClipRects> clipRects;
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
         OverlayScrollbarSizeRelevancy scrollbarRelevancy;
 #endif
     };