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>

2 files changed, 8 insertions, 8 deletions

diff --git a/testing/embedder_test.cpp b/testing/embedder_test.cpp
index aaea965cf0..03eebe3abc 100644
--- a/testing/embedder_test.cpp
+++ b/testing/embedder_test.cpp
@@ -220,7 +220,7 @@ bool EmbedderTest::OpenDocumentHelper(const char* password,
     FPDF_LoadXFA(*document);
 #endif  // PDF_ENABLE_XFA
 
-  static_cast<void>(FPDF_GetDocPermissions(*document));
+  (void)FPDF_GetDocPermissions(*document);
   return true;
 }
 
@@ -262,16 +262,16 @@ void EmbedderTest::DoOpenActions() {
 
 int EmbedderTest::GetFirstPageNum() {
   int first_page = FPDFAvail_GetFirstPageNum(document_);
-  static_cast<void>(FPDFAvail_IsPageAvail(
-      avail_, first_page, fake_file_access_->GetDownloadHints()));
+  (void)FPDFAvail_IsPageAvail(avail_, first_page,
+                              fake_file_access_->GetDownloadHints());
   return first_page;
 }
 
 int EmbedderTest::GetPageCount() {
   int page_count = FPDF_GetPageCount(document_);
   for (int i = 0; i < page_count; ++i)
-    static_cast<void>(FPDFAvail_IsPageAvail(
-        avail_, i, fake_file_access_->GetDownloadHints()));
+    (void)FPDFAvail_IsPageAvail(avail_, i,
+                                fake_file_access_->GetDownloadHints());
   return page_count;
 }
 
diff --git a/testing/test_support.cpp b/testing/test_support.cpp
index 16ae5b28b9..2b6f436c32 100644
--- a/testing/test_support.cpp
+++ b/testing/test_support.cpp
@@ -84,19 +84,19 @@ std::unique_ptr<char, pdfium::FreeDeleter> GetFileContents(const char* filename,
     fprintf(stderr, "Failed to open: %s\n", filename);
     return nullptr;
   }
-  static_cast<void>(fseek(file, 0, SEEK_END));
+  (void)fseek(file, 0, SEEK_END);
   size_t file_length = ftell(file);
   if (!file_length) {
     return nullptr;
   }
-  static_cast<void>(fseek(file, 0, SEEK_SET));
+  (void)fseek(file, 0, SEEK_SET);
   std::unique_ptr<char, pdfium::FreeDeleter> buffer(
       static_cast<char*>(malloc(file_length)));
   if (!buffer) {
     return nullptr;
   }
   size_t bytes_read = fread(buffer.get(), 1, file_length, file);
-  static_cast<void>(fclose(file));
+  (void)fclose(file);
   if (bytes_read != file_length) {
     fprintf(stderr, "Failed to read: %s\n", filename);
     return nullptr;