Revert of remvoe duplicate impl for SkImageInfo flattening

tests/SerializationTest.cpp

Index: tests/SerializationTest.cpp
diff --git a/tests/SerializationTest.cpp b/tests/SerializationTest.cpp
index f1d0f900fd0eca09f187017b1b246e251f651635..7ae06d737e4f7643aa7e56abe06a01850ca8eb14 100644
--- a/tests/SerializationTest.cpp
+++ b/tests/SerializationTest.cpp
@@ -148,7 +148,6 @@
     REPORTER_ASSERT(reporter, SkAlign4(bytesWritten) == bytesWritten);
 
     unsigned char dataWritten[1024];
-    SkASSERT(bytesWritten <= sizeof(dataWritten));
     writer.writeToMemory(dataWritten);
 
     // Make sure this fails when it should (test with smaller size, but still multiple of 4)
@@ -308,22 +307,10 @@
         TestBitmapSerialization(validBitmap, invalidBitmap, true, reporter);
 
         // Create a bitmap with a pixel ref too small
-        SkImageInfo info;
-        info.fWidth = 256;
-        info.fHeight = 256;
-        info.fColorType = kPMColor_SkColorType;
-        info.fAlphaType = kPremul_SkAlphaType;
-
         SkBitmap invalidBitmap2;
-        invalidBitmap2.setConfig(info);
-        
-        // Hack to force invalid, by making the pixelref smaller than its
-        // owning bitmap.
-        info.fWidth = 32;
-        info.fHeight = 1;
-        
-        invalidBitmap2.setPixelRef(SkMallocPixelRef::NewAllocate(
-                        info, invalidBitmap2.rowBytes(), NULL))->unref();
+        invalidBitmap2.setConfig(SkBitmap::kARGB_8888_Config, 256, 256);
+        invalidBitmap2.setPixelRef(SkNEW_ARGS(SkMallocPixelRef,
+            (NULL, 256, NULL)))->unref();
 
         // The deserialization should detect the pixel ref being too small and fail
         TestBitmapSerialization(validBitmap, invalidBitmap2, false, reporter);