Combine corpus runner into test_runner.py

testing/test_support.cpp

 // Copyright 2015 PDFium 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 "testing/test_support.h"
 
 #include <stdio.h>
 #include <string.h>
 
 #include <string>
@@ skipping 59 matching lines @@
   v8::V8::SetFlagsFromString(predictable_flag,
                              static_cast<int>(strlen(predictable_flag)));
 }
 #endif  // PDF_ENABLE_V8
 
 }  // namespace
 
 std::unique_ptr<char, pdfium::FreeDeleter> GetFileContents(const char* filename,
                                                            size_t* retlen) {
   FILE* file = fopen(filename, "rb");
-  if (!file) {
-    fprintf(stderr, "Failed to open: %s\n", filename);
+  if (!file)
     return nullptr;
-  }
+
   (void)fseek(file, 0, SEEK_END);
   size_t file_length = ftell(file);
   if (!file_length) {
     return nullptr;
   }
   (void)fseek(file, 0, SEEK_SET);
   std::unique_ptr<char, pdfium::FreeDeleter> buffer(
       static_cast<char*>(malloc(file_length)));
   if (!buffer) {
     return nullptr;
@@ skipping 106 matching lines @@
 }
 
 // static
 int TestSaver::WriteBlockCallback(FPDF_FILEWRITE* pFileWrite,
                                   const void* data,
                                   unsigned long size) {
   TestSaver* pThis = static_cast<TestSaver*>(pFileWrite);
   pThis->m_String.append(static_cast<const char*>(data), size);
   return 1;
 }