Revert "Convert (void) to static_cast<void> in C++ code"

This reverts commit 80c6ab7b99bcbd7b940f78dc0cac52c30249f59c.

Reason for revert: (void) idiom is prevalent through out C++ code.

Original change's description:
> Convert (void) to static_cast<void> in C++ code
> 
> Converting instances of old C-style void casts to suppress return
> values to use C++ style static cases. There are a few examples of
> (void) that remain, since they are in C code, and the third_party/
> instances are not touched at all.
> 
> Change-Id: I72b3fc0e1d713db669b76135e03d1cf87873a2fe
> Reviewed-on: https://pdfium-review.googlesource.com/33790
> Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
> Commit-Queue: Ryan Harrison <rharrison@chromium.org>

TBR=thestig@chromium.org,tsepez@chromium.org,dsinclair@chromium.org,hnakashima@chromium.org,rharrison@chromium.org

Change-Id: Ib6cc021c97cb1ea7c71b90346fa9b500659f565d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://pdfium-review.googlesource.com/33890
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/samples/pdfium_test.cc b/samples/pdfium_test.cc
index 0491840b34..d2e84872d6 100644
--- a/samples/pdfium_test.cc
+++ b/samples/pdfium_test.cc
@@ -682,7 +682,7 @@ void RenderPdf(const std::string& name,
     return;
   }
 
-  static_cast<void>(FPDF_GetDocPermissions(doc.get()));
+  (void)FPDF_GetDocPermissions(doc.get());
 
   if (options.show_metadata)
     DumpMetaData(doc.get());