Replace SkPicture(SkStream) constructors with a factory.

tests/PictureTest.cpp

Index: tests/PictureTest.cpp
diff --git a/tests/PictureTest.cpp b/tests/PictureTest.cpp
index 23ff6893c0f4d867fb7d1754c5ba6e75d1e2d99f..49bc57b1af29960e5cafa0cc709440d2171f0559 100644
--- a/tests/PictureTest.cpp
+++ b/tests/PictureTest.cpp
@@ -420,10 +420,9 @@ static void test_bitmap_with_encoded_data(skiatest::Reporter* reporter) {
     context.fReporter = reporter;
     SkSetErrorCallback(assert_one_parse_error_cb, &context);
     SkMemoryStream pictureStream(picture1);
-    bool success;
     SkClearLastError();
-    SkPicture pictureFromStream(&pictureStream, &success, NULL);
-    REPORTER_ASSERT(reporter, success);
+    SkAutoUnref pictureFromStream(SkPicture::CreateFromStream(&pictureStream, NULL));
+    REPORTER_ASSERT(reporter, pictureFromStream.get() != NULL);
     SkClearLastError();
     SkSetErrorCallback(NULL, NULL);
 }