More win64 warning fixes

src/gpu/GrSWMaskHelper.h

Index: src/gpu/GrSWMaskHelper.h
diff --git a/src/gpu/GrSWMaskHelper.h b/src/gpu/GrSWMaskHelper.h
index 1eef46ecff31af6c6f7031486132b5b229f29219..229b0e5e90469481ae5e1c9c7738ad5dffec6d26 100644
--- a/src/gpu/GrSWMaskHelper.h
+++ b/src/gpu/GrSWMaskHelper.h
@@ -128,7 +128,7 @@ private:
     // Actually sends the texture data to the GPU. This is called from
     // toTexture with the data filled in depending on the texture config.
     void sendTextureData(GrTexture *texture, const GrSurfaceDesc& desc,
-                         const void *data, int rowbytes);
+                         const void *data, size_t rowbytes);
 
     // Compresses the bitmap stored in fBM and sends the compressed data
     // to the GPU to be stored in 'texture' using sendTextureData.