[SPv2] Remove PaintArtifactCompositor::initializeIfNeeded.

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.h

Index: third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.h
diff --git a/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.h b/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.h
index bbcfd9ce638d1235dd2a6f8e1ecbccca7a6f7c3b..358c3be505f43c086d1e82daa0d40aa6c84ac8c9 100644
--- a/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.h
+++ b/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.h
@@ -33,11 +33,6 @@ public:
     PaintArtifactCompositor();
     ~PaintArtifactCompositor();
 
-    // Creates at least a root layer to be managed by this controller. Can't be
-    // done in the constructor, since RuntimeEnabledFeatures may not be
-    // initialized yet.
-    void initializeIfNeeded();
-
     // Updates the layer tree to match the provided paint artifact.
     // Creates the root layer if not already done.
     void update(const PaintArtifact&);