deprecate odd variants of SkCanvas::readPixels

Bug: skia:6513
Change-Id: I51179a85f0912d3f899c368c30a943d346dd1d05
Reviewed-on: https://skia-review.googlesource.com/13589
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/tests/BlurTest.cpp b/tests/BlurTest.cpp
index 744e202..985917f 100644
--- a/tests/BlurTest.cpp
+++ b/tests/BlurTest.cpp
@@ -242,10 +242,7 @@
 static void readback(SkCanvas* canvas, int* result, int resultCount) {
     SkBitmap readback;
     readback.allocN32Pixels(resultCount, 30);
-
-    SkIRect readBackRect = { 0, 0, resultCount, 30 };
-
-    canvas->readPixels(readBackRect, &readback);
+    canvas->readPixels(readback, 0, 0);
 
     readback.lockPixels();
     SkPMColor* pixels = (SkPMColor*) readback.getAddr32(0, 15);