Fix a GetFileContents() call that should have been in commit aa326bd6.

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 "testing/utils/path_service.h"
@@ skipping 27 matching lines @@
   return result;
 }
 
 bool GetExternalData(const std::string& exe_path,
                      const std::string& bin_dir,
                      const std::string& filename,
                      v8::StartupData* result_data) {
   std::string full_path =
       GetFullPathForSnapshotFile(exe_path, bin_dir, filename);
   size_t data_length = 0;
-  char* data_buffer = GetFileContents(full_path.c_str(), &data_length);
-  if (!data_buffer) {
+  std::unique_ptr<char, pdfium::FreeDeleter> data_buffer =
+      GetFileContents(full_path.c_str(), &data_length);
+  if (!data_buffer)
     return false;
-  }
-  result_data->data = const_cast<const char*>(data_buffer);
+
+  result_data->data = data_buffer.release();
   result_data->raw_size = data_length;
   return true;
 }
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 
 void InitializeV8Common(v8::Platform** platform) {
   v8::V8::InitializeICU();
 
   *platform = v8::platform::CreateDefaultPlatform();
   v8::V8::InitializePlatform(*platform);
@@ skipping 101 matching lines @@
                          unsigned long pos,
                          unsigned char* pBuf,
                          unsigned long size) {
   TestLoader* pLoader = static_cast<TestLoader*>(param);
   if (pos + size < pos || pos + size > pLoader->m_Len)
     return 0;
 
   memcpy(pBuf, pLoader->m_pBuf + pos, size);
   return 1;
 }