libwebp: update to 0.4.2-rc2

third_party/libwebp/dsp/lossless.h

Index: third_party/libwebp/dsp/lossless.h
diff --git a/third_party/libwebp/dsp/lossless.h b/third_party/libwebp/dsp/lossless.h
index e4da705f22a17f20ba4a4b874203fc1d678d4ec9..8c7551c9c2afbfff32df286c19d525db66441b3c 100644
--- a/third_party/libwebp/dsp/lossless.h
+++ b/third_party/libwebp/dsp/lossless.h
@@ -56,24 +56,20 @@ extern VP8LConvertFunc VP8LConvertBGRAToRGB565;
 extern VP8LConvertFunc VP8LConvertBGRAToBGR;
 
 // Expose some C-only fallback functions
-extern void VP8LTransformColor_C(const VP8LMultipliers* const m,
+void VP8LTransformColor_C(const VP8LMultipliers* const m,
+                          uint32_t* data, int num_pixels);
+void VP8LTransformColorInverse_C(const VP8LMultipliers* const m,
                                  uint32_t* data, int num_pixels);
-extern void VP8LTransformColorInverse_C(const VP8LMultipliers* const m,
-                                        uint32_t* data, int num_pixels);
-
-extern void VP8LConvertBGRAToRGB_C(const uint32_t* src,
-                                   int num_pixels, uint8_t* dst);
-extern void VP8LConvertBGRAToRGBA_C(const uint32_t* src,
-                                    int num_pixels, uint8_t* dst);
-extern void VP8LConvertBGRAToRGBA4444_C(const uint32_t* src,
-                                        int num_pixels, uint8_t* dst);
-extern void VP8LConvertBGRAToRGB565_C(const uint32_t* src,
-                                      int num_pixels, uint8_t* dst);
-extern void VP8LConvertBGRAToBGR_C(const uint32_t* src,
-                                   int num_pixels, uint8_t* dst);
-extern void VP8LSubtractGreenFromBlueAndRed_C(uint32_t* argb_data,
-                                              int num_pixels);
-extern void VP8LAddGreenToBlueAndRed_C(uint32_t* data, int num_pixels);
+
+void VP8LConvertBGRAToRGB_C(const uint32_t* src, int num_pixels, uint8_t* dst);
+void VP8LConvertBGRAToRGBA_C(const uint32_t* src, int num_pixels, uint8_t* dst);
+void VP8LConvertBGRAToRGBA4444_C(const uint32_t* src,
+                                 int num_pixels, uint8_t* dst);
+void VP8LConvertBGRAToRGB565_C(const uint32_t* src,
+                               int num_pixels, uint8_t* dst);
+void VP8LConvertBGRAToBGR_C(const uint32_t* src, int num_pixels, uint8_t* dst);
+void VP8LSubtractGreenFromBlueAndRed_C(uint32_t* argb_data, int num_pixels);
+void VP8LAddGreenToBlueAndRed_C(uint32_t* data, int num_pixels);
 
 // Must be called before calling any of the above methods.
 void VP8LDspInit(void);