Use the exact-width integer types defined in <stdint.h> rather than

net/base/elements_upload_data_stream.h

Index: net/base/elements_upload_data_stream.h
diff --git a/net/base/elements_upload_data_stream.h b/net/base/elements_upload_data_stream.h
index 5101114a3cca213ba193a906182d74a12121d036..c65c3c61b670cd41a7eeb211f4dd6c089726e7c0 100644
--- a/net/base/elements_upload_data_stream.h
+++ b/net/base/elements_upload_data_stream.h
@@ -24,7 +24,7 @@ class UploadElementReader;
 class NET_EXPORT ElementsUploadDataStream : public UploadDataStream {
  public:
   ElementsUploadDataStream(ScopedVector<UploadElementReader> element_readers,
-                           int64 identifier);
+                           int64_t identifier);
 
   ~ElementsUploadDataStream() override;
 
@@ -32,7 +32,7 @@ class NET_EXPORT ElementsUploadDataStream : public UploadDataStream {
   // scoped_ptr<UploadDataStream> for ease of use.
   static scoped_ptr<UploadDataStream> CreateWithReader(
       scoped_ptr<UploadElementReader> reader,
-      int64 identifier);
+      int64_t identifier);
 
  private:
   // UploadDataStream implementation.