mac: Remove IsOSSnowLeopard().

printing/pdf_metafile_cg_mac.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "printing/pdf_metafile_cg_mac.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
@@ skipping 62 matching lines @@
       NOTREACHED();
       break;
   }
 }
 
 }  // namespace
 
 namespace printing {
 
 PdfMetafileCg::PdfMetafileCg()
-    : page_is_open_(false),
-      thread_pdf_docs_owned_(false) {
-  if (!thread_pdf_docs.Pointer()->Get() &&
-      base::mac::IsOSSnowLeopard()) {
-    thread_pdf_docs_owned_ = true;
-    thread_pdf_docs.Pointer()->Set(
-        CFSetCreateMutable(kCFAllocatorDefault, 0, &kCFTypeSetCallBacks));
-  }
-}
+    : page_is_open_(false), thread_pdf_docs_owned_(false) {}
 
 PdfMetafileCg::~PdfMetafileCg() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (pdf_doc_ && thread_pdf_docs.Pointer()->Get()) {
     // Transfer ownership to the pool.
     CFSetAddValue(thread_pdf_docs.Pointer()->Get(), pdf_doc_);
   }
 
   if (thread_pdf_docs_owned_) {
     CFRelease(thread_pdf_docs.Pointer()->Get());
@@ skipping 232 matching lines @@
 
   if (!pdf_doc_.get()) {
     ScopedCFTypeRef<CGDataProviderRef> pdf_data_provider(
         CGDataProviderCreateWithCFData(pdf_data_));
     pdf_doc_.reset(CGPDFDocumentCreateWithProvider(pdf_data_provider));
   }
   return pdf_doc_.get();
 }
 
 }  // namespace printing