Refactor rtc_unittests into several targets.

webrtc/base/file_unittest.cc

 /*
  *  Copyright 2016 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 34 matching lines @@
   }
   // Prevent the same buffer from being verified multiple times simply
   // because some operation that should have written to it failed
   memset(buffer, 0, length);
   return true;
 }
 
 class FileTest : public ::testing::Test {
  protected:
   std::string path_;
-  void SetUp() {
+  void SetUp() override {
     path_ = webrtc::test::TempFilename(webrtc::test::OutputPath(), "test_file");
     ASSERT_FALSE(path_.empty());
   }
-  void TearDown() { RemoveFile(path_); }
+  void TearDown() override { RemoveFile(path_); }
 };
 
 TEST_F(FileTest, DefaultConstructor) {
   File file;
   uint8_t buffer[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
 
   EXPECT_FALSE(file.IsOpen());
   EXPECT_EQ(0u, file.Write(buffer, 10));
   EXPECT_FALSE(file.Seek(0));
   EXPECT_EQ(0u, file.Read(buffer, 10));
@@ skipping 122 matching lines @@
 TEST_F(FileTest, ShouldBeAbleToRemoveFile) {
   {
     File file = File::Open(Pathname(path_));
     ASSERT_TRUE(file.IsOpen()) << "Error: " << LastError();
   }
 
   ASSERT_TRUE(File::Remove(Pathname(path_))) << "Error: " << LastError();
 }
 
 }  // namespace rtc