SkPDF/Deflate: clean up old SkFlate code

tests/PDFDeflateWStreamTest.cpp

Index: tests/PDFDeflateWStreamTest.cpp
diff --git a/tests/PDFDeflateWStreamTest.cpp b/tests/PDFDeflateWStreamTest.cpp
index bc0defc5fe202eb4e1b86d4389e82631ee7fd7bf..808ef17c2f0ea4785e16337098acc5b94821bcf6 100644
--- a/tests/PDFDeflateWStreamTest.cpp
+++ b/tests/PDFDeflateWStreamTest.cpp
@@ -34,13 +34,7 @@ DEF_TEST(SkDeflateWStream, r) {
         }
         SkAutoTDelete<SkStreamAsset> compressed(
                 dynamicMemoryWStream.detachAsStream());
-
-        SkDynamicMemoryWStream decompressedDynamicMemoryWStream;
-        SkAssertResult(SkFlate::Inflate(compressed,
-                                        &decompressedDynamicMemoryWStream));
-
-        SkAutoTDelete<SkStreamAsset> decompressed(
-                decompressedDynamicMemoryWStream.detachAsStream());
+        SkAutoTDelete<SkStreamAsset> decompressed(SkInflate(compressed));
 
         if (decompressed->getLength() != size) {
             ERRORF(r, "Decompression failed to get right size [%d]."