Refactor fileutils.cc/h and fileutils_unittests.cc into their own targets.

webrtc/test/testsupport/fileutils_unittest.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 19 matching lines @@
 
 namespace webrtc {
 
 // Test fixture to restore the working directory between each test, since some
 // of them change it with chdir during execution (not restored by the
 // gtest framework).
 class FileUtilsTest : public testing::Test {
  protected:
   FileUtilsTest() {
   }
-  virtual ~FileUtilsTest() {}
+  ~FileUtilsTest() override {}
   // Runs before the first test
   static void SetUpTestCase() {
     original_working_dir_ = webrtc::test::WorkingDir();
   }
-  void SetUp() {
+  void SetUp() override {
     ASSERT_EQ(chdir(original_working_dir_.c_str()), 0);
   }
-  void TearDown() {
+  void TearDown() override {
     ASSERT_EQ(chdir(original_working_dir_.c_str()), 0);
   }
  private:
   static std::string original_working_dir_;
 };
 
 std::string FileUtilsTest::original_working_dir_ = "";
 
 // Tests that the project output dir path is returned for the default working
 // directory that is automatically set when the test executable is launched.
@@ skipping 78 matching lines @@
   fclose(file);
   ASSERT_GT(webrtc::test::GetFileSize(std::string(temp_filename.c_str())), 0u);
   remove(temp_filename.c_str());
 }
 
 TEST_F(FileUtilsTest, GetFileSizeNonExistingFile) {
   ASSERT_EQ(0u, webrtc::test::GetFileSize("non-existing-file.tmp"));
 }
 
 }  // namespace webrtc