cc: Increment the ref count when assigning the SkImageFilter

cc/layer.cc

Index: cc/layer.cc
diff --git a/cc/layer.cc b/cc/layer.cc
index 5ba8451772c9cb2b6733817c54ebecfd934bfcb4..1ed771085946c200de2324842e5ab81b3d355d4b 100644
--- a/cc/layer.cc
+++ b/cc/layer.cc
@@ -81,8 +81,6 @@ Layer::~Layer()
 
     // Remove the parent reference from all children.
     removeAllChildren();
-
-    SkSafeUnref(m_filter);
 }
 
 void Layer::setUseLCDText(bool useLCDText)
@@ -328,12 +326,12 @@ void Layer::setFilters(const WebKit::WebFilterOperations& filters)
         LayerTreeHost::setNeedsFilterContext(true);
 }
 
-void Layer::setFilter(SkImageFilter* filter)
+void Layer::setFilter(const SkRefPtr<SkImageFilter>& filter)
 {
-    if (m_filter == filter)
+    if (m_filter.get() == filter.get())
         return;
     DCHECK(m_filters.isEmpty());
-    SkRefCnt_SafeAssign(m_filter, filter);
+    m_filter = filter;
     setNeedsCommit();
     if (filter)
         LayerTreeHost::setNeedsFilterContext(true);