Remove RenderLayerFilterInfo::m_dirtySourceRect

Source/core/rendering/FilterEffectRenderer.cpp

Index: Source/core/rendering/FilterEffectRenderer.cpp
diff --git a/Source/core/rendering/FilterEffectRenderer.cpp b/Source/core/rendering/FilterEffectRenderer.cpp
index 99f1f403fabefb5844a948eb15397e0b279d1532..98ff80306014d64a3448757cf8e7cbf4fbbdaa83 100644
--- a/Source/core/rendering/FilterEffectRenderer.cpp
+++ b/Source/core/rendering/FilterEffectRenderer.cpp
@@ -301,7 +301,7 @@ LayoutRect FilterEffectRenderer::computeSourceImageRectForDirtyRect(const Layout
     return LayoutRect(rectForRepaint);
 }
 
-bool FilterEffectRendererHelper::prepareFilterEffect(RenderLayer* renderLayer, const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect, const LayoutRect& layerRepaintRect)
+bool FilterEffectRendererHelper::prepareFilterEffect(RenderLayer* renderLayer, const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect)
 {
     ASSERT(m_haveFilterEffect && renderLayer->filterRenderer());
     m_renderLayer = renderLayer;
@@ -337,10 +337,8 @@ bool FilterEffectRendererHelper::prepareFilterEffect(RenderLayer* renderLayer, c
     if (filter->hasFilterThatMovesPixels()) {
         if (hasUpdatedBackingStore)
             m_repaintRect = filterSourceRect;
-        else {
-            m_repaintRect.unite(layerRepaintRect);
+        else
             m_repaintRect.intersect(filterSourceRect);
-        }
     }
     return true;
 }