Return unique_ptrs from test_support functions

testing/embedder_test.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/embedder_test.h"
 
 #include <limits.h>
 
 #include <list>
 #include <string>
@@ skipping 72 matching lines @@
   }
   FPDFAvail_Destroy(avail_);
   FPDF_DestroyLibrary();
 
 #ifdef PDF_ENABLE_V8
   v8::V8::ShutdownPlatform();
   delete platform_;
 #endif  // PDF_ENABLE_V8
 
   delete loader_;
-  free(file_contents_);
 }
 
 bool EmbedderTest::OpenDocument(const std::string& filename,
                                 bool must_linearize) {
   std::string file_path;
   if (!PathService::GetTestFilePath(filename, &file_path))
     return false;
   file_contents_ = GetFileContents(file_path.c_str(), &file_length_);
   if (!file_contents_)
     return false;
 
-  loader_ = new TestLoader(file_contents_, file_length_);
+  loader_ = new TestLoader(file_contents_.get(), file_length_);
   file_access_.m_FileLen = static_cast<unsigned long>(file_length_);
   file_access_.m_GetBlock = TestLoader::GetBlock;
   file_access_.m_Param = loader_;
 
   file_avail_.version = 1;
   file_avail_.IsDataAvail = Is_Data_Avail;
 
   hints_.version = 1;
   hints_.AddSegment = Add_Segment;
 
@@ skipping 169 matching lines @@
 }
 
 // Can't use gtest-provided main since we need to stash the path to the
 // executable in order to find the external V8 binary data files.
 int main(int argc, char** argv) {
   g_exe_path_ = argv[0];
   testing::InitGoogleTest(&argc, argv);
   testing::InitGoogleMock(&argc, argv);
   return RUN_ALL_TESTS();
 }