zlib/pdf: remove HaveFlate(), depend on preprocessor defines

src/core/SkFlate.cpp

Index: src/core/SkFlate.cpp
diff --git a/src/core/SkFlate.cpp b/src/core/SkFlate.cpp
index ff11a11ca89eecdb01ab90aa1f178c5aae49bef0..888af6b77c60972d9d385eaaca9bc4afd9f4dacf 100644
--- a/src/core/SkFlate.cpp
+++ b/src/core/SkFlate.cpp
@@ -11,18 +11,7 @@
 #include "SkFlate.h"
 #include "SkStream.h"
 
-#ifdef SK_NO_FLATE
-bool SkFlate::HaveFlate() { return false; }
-bool SkFlate::Deflate(SkStream*, SkWStream*) { return false; }
-bool SkFlate::Deflate(const void*, size_t, SkWStream*) { return false; }
-bool SkFlate::Deflate(const SkData*, SkWStream*) { return false; }
-bool SkFlate::Inflate(SkStream*, SkWStream*) { return false; }
-#else
-
-// static
-bool SkFlate::HaveFlate() {
-    return true;
-}
+#ifndef SK_NO_FLATE
 
 namespace {
 
@@ -133,4 +122,5 @@ bool SkFlate::Inflate(SkStream* src, SkWStream* dst) {
     return doFlate(false, src, dst);
 }
 
-#endif
+#endif  // SK_NO_FLATE
+