Remove the CSS_COMPOSITING define, the CSS blending and compositing

bindings/v8/RuntimeEnabledFeatures.h

Index: bindings/v8/RuntimeEnabledFeatures.h
===================================================================
--- bindings/v8/RuntimeEnabledFeatures.h	(revision 148420)
+++ bindings/v8/RuntimeEnabledFeatures.h	(working copy)
@@ -80,13 +80,8 @@
     static bool cssRegionsEnabled() { return false; }
 #endif
 
-#if ENABLE(CSS_COMPOSITING)
     static void setCSSCompositingEnabled(bool isEnabled) { isCSSCompositingEnabled = isEnabled; }
     static bool cssCompositingEnabled() { return isCSSCompositingEnabled; }
-#else
-    static void setCSSCompositingEnabled(bool) { }
-    static bool cssCompositingEnabled() { return false; }
-#endif
 
 #if ENABLE(FONT_LOAD_EVENTS)
     static void setFontLoadEventsEnabled(bool isEnabled) { isFontLoadEventsEnabled = isEnabled; }