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 66f0cf4d37d7d4640ffcd7f51710b07c0cedc3af..19644ce4102d7ecd46e2777c36551dcc019daeb4 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -1098,11 +1098,6 @@ bool Document::cssStickyPositionEnabled() const
     return settings() && settings()->cssStickyPositionEnabled();
 }
 
-bool Document::cssRegionsEnabled() const
-{
-    return RuntimeEnabledFeatures::cssRegionsEnabled();
-}
-
 bool Document::cssCompositingEnabled() const
 {
     return RuntimeEnabledFeatures::cssCompositingEnabled();
@@ -1113,11 +1108,9 @@ 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();
@@ -1125,8 +1118,6 @@ PassRefPtr<DOMNamedFlowCollection> Document::webkitGetNamedFlows()
     return namedFlows()->createCSSOMSnapshot();
 }
 
-#endif
-
 NamedFlowCollection* Document::namedFlows()
 {
     if (!m_namedFlows)