Revert of SkPDF: PDF/A runtime switch

src/pdf/SkPDFMetadata.cpp

Index: src/pdf/SkPDFMetadata.cpp
diff --git a/src/pdf/SkPDFMetadata.cpp b/src/pdf/SkPDFMetadata.cpp
index 2765d4d189b99b0ae0042b0ff531f12797762370..a5476a2df0980e6755be98f62f3038be15c2f416 100644
--- a/src/pdf/SkPDFMetadata.cpp
+++ b/src/pdf/SkPDFMetadata.cpp
@@ -5,11 +5,14 @@
  * found in the LICENSE file.
  */
 
-#include "SkMD5.h"
 #include "SkMilestone.h"
 #include "SkPDFMetadata.h"
 #include "SkPDFTypes.h"
 #include <utility>
+
+#ifdef SK_PDF_GENERATE_PDFA
+#include "SkMD5.h"
+#endif
 
 static SkString pdf_date(const SkTime::DateTime& dt) {
     int timeZoneMinutes = SkToInt(dt.fTimeZoneMinutes);
@@ -49,6 +52,7 @@
     return dict.release();
 }
 
+#ifdef SK_PDF_GENERATE_PDFA
 SkPDFMetadata::UUID SkPDFMetadata::uuid() const {
     // The main requirement is for the UUID to be unique; the exact
     // format of the data that will be hashed is not important.
@@ -346,6 +350,8 @@
             documentID.c_str(), instanceID.c_str(), keywords2.c_str()));
 }
 
+#endif  // SK_PDF_GENERATE_PDFA
+
 #undef SKPDF_STRING
 #undef SKPDF_STRING_IMPL