add optional pref-config table to codecs



git-svn-id: http://skia.googlecode.com/svn/trunk@519 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/images/SkImageDecoder_wbmp.cpp b/src/images/SkImageDecoder_wbmp.cpp
index ac242ea..6d63ca9 100644
--- a/src/images/SkImageDecoder_wbmp.cpp
+++ b/src/images/SkImageDecoder_wbmp.cpp
@@ -29,8 +29,7 @@
     }
     
 protected:
-    virtual bool onDecode(SkStream* stream, SkBitmap* bm,
-                          SkBitmap::Config pref, Mode);
+    virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode);
 };
 
 static bool read_byte(SkStream* stream, uint8_t* data)
@@ -107,7 +106,7 @@
 #define SkAlign8(x)     (((x) + 7) & ~7)
 
 bool SkWBMPImageDecoder::onDecode(SkStream* stream, SkBitmap* decodedBitmap,
-                                  SkBitmap::Config prefConfig, Mode mode)
+                                  Mode mode)
 {
     wbmp_head   head;