Fix the reference box computation for CSS filter effects.

third_party/WebKit/Source/core/style/ComputedStyle.h

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index 9952068a8c8bf9357de4cf4d7137aa2641acfc6f..aa113c766dd40d01d9d615f0099394e6d20ad766 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -438,8 +438,6 @@ public:
     }
 
     bool hasFilterOutsets() const { return hasFilter() && filter().hasOutsets(); }
-    FilterOutsets filterOutsets() const { return hasFilter() ? filter().outsets() : FilterOutsets(); }
-
     Order rtlOrdering() const { return static_cast<Order>(inherited_flags.m_rtlOrdering); }
     void setRTLOrdering(Order o) { inherited_flags.m_rtlOrdering = o; }