Refactor SkiaImageFilterBuilder into a namespace.

third_party/WebKit/Source/core/paint/FilterPainter.cpp

Index: third_party/WebKit/Source/core/paint/FilterPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/FilterPainter.cpp b/third_party/WebKit/Source/core/paint/FilterPainter.cpp
index 9e399bb7870956ef6ac6ae10313350f87bd0d9ec..cfc6cd84b58266cbe557876da93336983be8a2a0 100644
--- a/third_party/WebKit/Source/core/paint/FilterPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/FilterPainter.cpp
@@ -36,9 +36,8 @@ FilterPainter::FilterPainter(PaintLayer& layer, GraphicsContext& context, const
 
     ASSERT(layer.filterInfo());
 
-    SkiaImageFilterBuilder builder;
     lastEffect->determineFilterPrimitiveSubregion(MapRectForward);
-    sk_sp<SkImageFilter> imageFilter = builder.build(lastEffect, ColorSpaceDeviceRGB);
+    sk_sp<SkImageFilter> imageFilter = SkiaImageFilterBuilder::build(lastEffect, ColorSpaceDeviceRGB);
     if (!imageFilter)
         return;
 
@@ -63,7 +62,7 @@ FilterPainter::FilterPainter(PaintLayer& layer, GraphicsContext& context, const
     if (!context.getPaintController().displayItemConstructionIsDisabled()) {
         FilterOperations filterOperations(layer.computeFilterOperations(m_layoutObject->styleRef()));
         OwnPtr<CompositorFilterOperations> compositorFilterOperations = adoptPtr(CompositorFactory::current().createFilterOperations());
-        builder.buildFilterOperations(filterOperations, compositorFilterOperations.get());
+        SkiaImageFilterBuilder::buildFilterOperations(filterOperations, compositorFilterOperations.get());
         // FIXME: It's possible to have empty CompositorFilterOperations here even
         // though the SkImageFilter produced above is non-null, since the
         // layer's FilterEffectBuilder can have a stale representation of