SkPDF: remove SK_NO_FLATE & dead code in SkPDFStream

tests/FlateTest.cpp

Index: tests/FlateTest.cpp
diff --git a/tests/FlateTest.cpp b/tests/FlateTest.cpp
index 17e8b2de2ab65589ea10ddefba435bd2f6ce921d..40efe1a5d85f9ff8f2e414a11292b961f6abc883 100644
--- a/tests/FlateTest.cpp
+++ b/tests/FlateTest.cpp
@@ -10,8 +10,6 @@
 #include "SkStream.h"
 #include "Test.h"
 
-#ifndef SK_NO_FLATE
-
 // A memory stream that reports zero size with the standard call, like
 // an unseekable file stream would.
 class SkZeroSizeMemStream : public SkMemoryStream {
@@ -114,4 +112,3 @@ DEF_TEST(Flate, reporter) {
     TestFlate(reporter, &fileStream, 512);
     TestFlate(reporter, &fileStream, 10240);
 }
-#endif  // SK_NO_FLATE