Remove the CSS_COMPOSITING define, leaving the implementation under the runtime flag, since runtime…

Source/core/rendering/style/RenderStyle.cpp

Index: Source/core/rendering/style/RenderStyle.cpp
diff --git a/Source/core/rendering/style/RenderStyle.cpp b/Source/core/rendering/style/RenderStyle.cpp
index deb6981216980c50e605f040ef8846ca04748876..8b58ff2a30724467ea3c4aa5f1eed0d9677e8480 100644
--- a/Source/core/rendering/style/RenderStyle.cpp
+++ b/Source/core/rendering/style/RenderStyle.cpp
@@ -609,10 +609,9 @@ StyleDifference RenderStyle::diff(const RenderStyle* other, unsigned& changedCon
             return StyleDifferenceRepaintLayer;
     }
     
-#if ENABLE(CSS_COMPOSITING)
-    if (rareNonInheritedData->m_effectiveBlendMode != other->rareNonInheritedData->m_effectiveBlendMode)
-        return StyleDifferenceRepaintLayer;
-#endif
+    if (RuntimeEnabledFeatures::cssCompositingEnabled())
+        if (rareNonInheritedData->m_effectiveBlendMode != other->rareNonInheritedData->m_effectiveBlendMode)
+            return StyleDifferenceRepaintLayer;
 
     if (rareNonInheritedData->opacity != other->rareNonInheritedData->opacity) {
         // Don't return early here; instead take note of the type of change,
@@ -793,7 +792,27 @@ void RenderStyle::setContent(QuoteType quote, bool add)
 
     rareNonInheritedData.access()->m_content = ContentData::create(quote);
 }
-    
+
+BlendMode RenderStyle::blendMode() const
+{
+    if (RuntimeEnabledFeatures::cssCompositingEnabled())
+        return static_cast<BlendMode>(rareNonInheritedData->m_effectiveBlendMode);
+    return BlendModeNormal;
+}
+
+void RenderStyle::setBlendMode(BlendMode v)
+{
+    if (RuntimeEnabledFeatures::cssCompositingEnabled())
+        rareNonInheritedData.access()->m_effectiveBlendMode = v;
+}
+
+bool RenderStyle::hasBlendMode() const
+{
+    if (RuntimeEnabledFeatures::cssCompositingEnabled())
+        return static_cast<BlendMode>(rareNonInheritedData->m_effectiveBlendMode) != BlendModeNormal;
+    return false;
+}
+
 inline bool requireTransformOrigin(const Vector<RefPtr<TransformOperation> >& transformOperations, RenderStyle::ApplyTransformOrigin applyOrigin)
 {
     // transform-origin brackets the transform with translate operations.