Make printing build on Win64

printing/pdf_metafile_skia.cc

Index: printing/pdf_metafile_skia.cc
===================================================================
--- printing/pdf_metafile_skia.cc	(revision 177853)
+++ printing/pdf_metafile_skia.cc	(working copy)
@@ -9,6 +9,7 @@
 #include "base/hash_tables.h"
 #include "base/metrics/histogram.h"
 #include "base/posix/eintr_wrapper.h"
+#include "base/safe_numerics.h"
 #include "skia/ext/vector_platform_device_skia.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
@@ -110,7 +111,7 @@
 }
 
 uint32 PdfMetafileSkia::GetDataSize() const {
-  return data_->pdf_stream_.getOffset();
+  return base::checked_numeric_cast<uint32>(data_->pdf_stream_.getOffset());
 }
 
 bool PdfMetafileSkia::GetData(void* dst_buffer,
@@ -238,7 +239,8 @@
     return NULL;
 
   PdfMetafileSkia* metafile = new PdfMetafileSkia;
-  metafile->InitFromData(data->bytes(), data->size());
+  metafile->InitFromData(data->bytes(),
+                         base::checked_numeric_cast<uint32>(data->size()));
   return metafile;
 }