Orphan ProcXfermode, with an eye towards removing it

BUG=skia:
R=scroggo@google.com, mtklein@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/240533003

git-svn-id: http://skia.googlecode.com/svn/trunk@14238 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/PaintTest.cpp b/tests/PaintTest.cpp
index ab2f22f..350860c 100644
--- a/tests/PaintTest.cpp
+++ b/tests/PaintTest.cpp
@@ -325,7 +325,7 @@
 
     SkWriteBuffer writer;
     SkPaint::FlatteningTraits::Flatten(writer, paint);
-    const size_t expectedBytesWritten = sizeof(void*) == 8 ? 44 : 36;
+    const size_t expectedBytesWritten = sizeof(void*) == 8 ? 36 : 28;
     ASSERT(expectedBytesWritten == writer.bytesWritten());
 
     const uint32_t* written = writer.getWriter32()->contiguousArray();