SkImage_Raster's pixels are always immutable.

tests/SkImageTest.cpp

Index: tests/SkImageTest.cpp
diff --git a/tests/SkImageTest.cpp b/tests/SkImageTest.cpp
index 508982cea6128c2f0e0c0d65b1af8d3afadb1926..d5c7eaa819bf7c7bab05b59d89bd25c51128c98d 100644
--- a/tests/SkImageTest.cpp
+++ b/tests/SkImageTest.cpp
@@ -26,8 +26,7 @@ DEF_TEST(SkImageFromBitmap_extractSubset, reporter) {
         canvas.drawIRect(r, p);
         SkBitmap dstBitmap;
         srcBitmap.extractSubset(&dstBitmap, r);
-        image.reset(SkNewImageFromRasterBitmap(dstBitmap, true, NULL,
-                                               kUnlocked_SharedPixelRefMode));
+        image.reset(SkNewImageFromRasterBitmap(dstBitmap, NULL, kUnlocked_SharedPixelRefMode));
     }
 
     SkBitmap tgt;