CompositingReasonFinder should use a virtual function instead of a nest of branches

Source/core/rendering/compositing/CompositingReasonFinder.h

Index: Source/core/rendering/compositing/CompositingReasonFinder.h
diff --git a/Source/core/rendering/compositing/CompositingReasonFinder.h b/Source/core/rendering/compositing/CompositingReasonFinder.h
index b4fdececd7464181bac55fa302f675364b012979..1ced213d6b17328ed8cfcf602e446fb1da5c3cc7 100644
--- a/Source/core/rendering/compositing/CompositingReasonFinder.h
+++ b/Source/core/rendering/compositing/CompositingReasonFinder.h
@@ -5,8 +5,8 @@
 #ifndef CompositingReasonFinder_h
 #define CompositingReasonFinder_h
 
-#include "core/page/ChromeClient.h"
 #include "core/rendering/RenderLayer.h"
+#include "core/rendering/compositing/CompositingTriggers.h"
 #include "platform/graphics/CompositingReasons.h"
 
 namespace WebCore {
@@ -38,8 +38,6 @@ private:
     bool requiresCompositingForAnimation(RenderObject*) const;
     bool requiresCompositingForTransition(RenderObject*) const;
     bool requiresCompositingForTransform(RenderObject*) const;
-    bool requiresCompositingForVideo(RenderObject*) const;
-    bool requiresCompositingForCanvas(RenderObject*) const;
     bool requiresCompositingForPlugin(RenderObject*, bool* needToRecomputeCompositingRequirements) const;
     bool requiresCompositingForFrame(RenderObject*, bool* needToRecomputeCompositingRequirements) const;
     bool requiresCompositingForBackfaceVisibilityHidden(RenderObject*) const;
@@ -50,7 +48,7 @@ private:
     bool requiresCompositingForWillChange(const RenderObject*) const;
 
     RenderView& m_renderView;
-    ChromeClient::CompositingTriggerFlags m_compositingTriggers;
+    CompositingTriggerFlags m_compositingTriggers;
 };
 
 } // namespace WebCore