move declaration of CreateLightingFilter into SkColorMatrixFilter

include/core/SkColorFilter.h

Index: include/core/SkColorFilter.h
diff --git a/include/core/SkColorFilter.h b/include/core/SkColorFilter.h
index 57650fbd98597a3f16fdf76f05c605dde8c18a6a..e89b2b1e4f30ed57c84add44832ce6f5cbb87c47 100644
--- a/include/core/SkColorFilter.h
+++ b/include/core/SkColorFilter.h
@@ -106,11 +106,7 @@ public:
     */
     static SkColorFilter* CreateModeFilter(SkColor c, SkXfermode::Mode mode);
 
-    /** Create a colorfilter that multiplies the RGB channels by one color, and
-        then adds a second color, pinning the result for each component to
-        [0..255]. The alpha components of the mul and add arguments
-        are ignored.
-    */
+    // DEPRECATED -- call this from SkColorMatrixFilter instead -- see skbug.com/4791
     static SkColorFilter* CreateLightingFilter(SkColor mul, SkColor add);
 
     /** Construct a colorfilter whose effect is to first apply the inner filter and then apply