SkImage doesn't use props, so don't need to store it

BUG=skia:
TBR=bsalomon

Review URL: https://codereview.chromium.org/1372153006
diff --git a/src/image/SkSurface_Raster.cpp b/src/image/SkSurface_Raster.cpp
index 7ee09c1..d5593eb 100644
--- a/src/image/SkSurface_Raster.cpp
+++ b/src/image/SkSurface_Raster.cpp
@@ -126,7 +126,7 @@
     }
     // Our pixels are in memory, so read access on the snapshot SkImage could be cheap.
     // Lock the shared pixel ref to ensure peekPixels() is usable.
-    return SkNewImageFromRasterBitmap(fBitmap, &this->props(),
+    return SkNewImageFromRasterBitmap(fBitmap,
                                       fWeOwnThePixels ? kNo_ForceCopyMode : kYes_ForceCopyMode);
 }