Change the return type of WTF::bind() to |OwnPtr<Function>|

Source/core/html/canvas/CanvasRenderingContext2D.cpp

Index: Source/core/html/canvas/CanvasRenderingContext2D.cpp
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.cpp b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
index fe0cdba7cea9198e06615357f1ed1a0d008bbeba..5501264ea919e5b8708c8c2d640e4e62905fd642 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.cpp
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
@@ -1639,7 +1639,7 @@ bool CanvasRenderingContext2D::rectContainsTransformedRect(const FloatRect& rect
     return state().m_transform.mapQuad(quad).containsQuad(transformedQuad);
 }
 
-void CanvasRenderingContext2D::fullCanvasCompositedDraw(const Closure& draw)
+void CanvasRenderingContext2D::fullCanvasCompositedDraw(PassOwnPtr<Closure> draw)
 {
     ASSERT(isFullCanvasCompositeMode(state().m_globalComposite));
 
@@ -1652,7 +1652,7 @@ void CanvasRenderingContext2D::fullCanvasCompositedDraw(const Closure& draw)
         c->beginLayer(1, state().m_globalComposite);
         c->setCompositeOperation(CompositeSourceOver);
         applyShadow(DrawShadowOnly);
-        draw();
+        (*draw)();
         c->setCompositeOperation(previousOperator);
         c->endLayer();
     }
@@ -1660,7 +1660,7 @@ void CanvasRenderingContext2D::fullCanvasCompositedDraw(const Closure& draw)
     c->beginLayer(1, state().m_globalComposite);
     c->clearShadow();
     c->setCompositeOperation(CompositeSourceOver);
-    draw();
+    (*draw)();
     c->setCompositeOperation(previousOperator);
     c->endLayer();
     applyShadow(DrawShadowAndForeground); // go back to normal shadows mode