use some helper Make functions to initialize SkImageInfo

BUG=
R=halcanary@google.com, scroggo@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/137993012

git-svn-id: http://skia.googlecode.com/svn/trunk@13081 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/MallocPixelRefTest.cpp b/tests/MallocPixelRefTest.cpp
index bf8f16d..5c28ac8 100644
--- a/tests/MallocPixelRefTest.cpp
+++ b/tests/MallocPixelRefTest.cpp
@@ -22,7 +22,7 @@
  */
 DEF_TEST(MallocPixelRef, reporter) {
     REPORTER_ASSERT(reporter, true);
-    SkImageInfo info = {10, 13, kPMColor_SkColorType, kPremul_SkAlphaType};
+    SkImageInfo info = SkImageInfo::MakeN32Premul(10, 13);
     {
         SkAutoTUnref<SkMallocPixelRef> pr(
             SkMallocPixelRef::NewAllocate(info, info.minRowBytes() - 1, NULL));