Use SkSafeRef when claiming a ref on the SkImageFilter at the WebKit API boundary.

webkit/compositor_bindings/web_layer_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "web_layer_impl.h"
 
 #include "SkMatrix44.h"
 #ifdef LOG
 #undef LOG
 #endif
@@ skipping 223 matching lines @@
     m_layer->setFilters(filters);
 }
 
 void WebLayerImpl::setBackgroundFilters(const WebFilterOperations& filters)
 {
     m_layer->setBackgroundFilters(filters);
 }
 
 void WebLayerImpl::setFilter(SkImageFilter* filter)
 {
-    filter->ref(); // Claim a reference for the compositor.
+    SkSafeRef(filter); // Claim a reference for the compositor.
     m_layer->setFilter(skia::AdoptRef(filter));
 }
 
 void WebLayerImpl::setDebugName(WebString name)
 {
     m_layer->setDebugName(UTF16ToASCII(string16(name.data(), name.length())));
 }
 
 void WebLayerImpl::setAnimationDelegate(WebAnimationDelegate* delegate)
 {
@@ skipping 167 matching lines @@
 {
     m_layer->setLayerScrollClient(scrollClient);
 }
 
 Layer* WebLayerImpl::layer() const
 {
     return m_layer.get();
 }
 
 } // namespace WebKit