Replace NULL with nullptr in all C++ files.

webrtc/tools/frame_editing/frame_editing_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 16 matching lines @@
 const size_t kFrameSize = CalcBufferSize(kI420, kWidth, kHeight);
 
 class FrameEditingTest : public ::testing::Test {
  protected:
   virtual void SetUp() {
     reference_video_ = ResourcePath("foreman_cif", "yuv");
     test_video_ = webrtc::test::TempFilename(webrtc::test::OutputPath(),
                                              "frame_editing_unittest.yuv");
 
     original_fid_ = fopen(reference_video_.c_str(), "rb");
-    ASSERT_TRUE(original_fid_ != NULL);
+    ASSERT_TRUE(original_fid_ != nullptr);
 
     // Ensure the output file exists on disk.
     std::ofstream(test_video_.c_str(), std::ios::out);
     // Open the output file for reading.
     // TODO(holmer): Figure out why this file has to be opened here (test fails
     // if it's opened after the write operation performed in EditFrames).
     edited_fid_ = fopen(test_video_.c_str(), "rb");
-    ASSERT_TRUE(edited_fid_ != NULL);
+    ASSERT_TRUE(edited_fid_ != nullptr);
 
     original_buffer_.reset(new int[kFrameSize]);
     edited_buffer_.reset(new int[kFrameSize]);
     num_frames_read_ = 0;
   }
   virtual void TearDown() {
     fclose(original_fid_);
     fclose(edited_fid_);
     remove(test_video_.c_str());
   }
@@ skipping 151 matching lines @@
       EXPECT_EQ(kFrameSize, num_bytes_read_);
       EXPECT_EQ(0, memcmp(original_buffer_.get(), edited_buffer_.get(),
                           kFrameSize));
     }
   }
   CompareToTheEnd(edited_fid_, original_fid_, &original_buffer_,
                   &edited_buffer_);
 }
 }  // namespace test
 }  // namespace webrtc