Remove CSS_REGIONS compile flag from Blink.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index e5fb9d1ba1cad97415af88843fd382318160bd0d..696b70ac77128791158bfbd210d9542352cb237c 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -1087,11 +1087,6 @@ bool Document::cssStickyPositionEnabled() const
     return settings() && settings()->cssStickyPositionEnabled(); 
 }
 
-bool Document::cssRegionsEnabled() const
-{
-    return RuntimeEnabledFeatures::cssRegionsEnabled(); 
-}
-
 bool Document::cssCompositingEnabled() const
 {
     return RuntimeEnabledFeatures::cssCompositingEnabled();
@@ -1102,11 +1097,9 @@ bool Document::cssGridLayoutEnabled() const
     return settings() && settings()->cssGridLayoutEnabled();
 }
 
-#if ENABLE(CSS_REGIONS)
-
 PassRefPtr<DOMNamedFlowCollection> Document::webkitGetNamedFlows()
 {
-    if (!cssRegionsEnabled() || !renderer())
+    if (!RuntimeEnabledFeatures::cssRegionsEnabled() || !renderer())
         return 0;
 
     updateStyleIfNeeded();
@@ -1114,8 +1107,6 @@ PassRefPtr<DOMNamedFlowCollection> Document::webkitGetNamedFlows()
     return namedFlows()->createCSSOMSnapshot();
 }
 
-#endif
-
 NamedFlowCollection* Document::namedFlows()
 {
     if (!m_namedFlows)