Replace NULL with nullptr in all C++ files.

webrtc/modules/desktop_capture/screen_capturer_unittest.cc

 /*
  *  Copyright (c) 2013 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 110 matching lines @@
       .WillOnce(SaveUniquePtrArg(&frame));
 
   capturer_->Start(&callback_);
   capturer_->CaptureFrame();
 
   ASSERT_TRUE(frame);
   EXPECT_GT(frame->size().width(), 0);
   EXPECT_GT(frame->size().height(), 0);
   EXPECT_GE(frame->stride(),
             frame->size().width() * DesktopFrame::kBytesPerPixel);
-  EXPECT_TRUE(frame->shared_memory() == NULL);
+  EXPECT_TRUE(frame->shared_memory() == nullptr);
 
   // Verify that the region contains whole screen.
   EXPECT_FALSE(frame->updated_region().is_empty());
   DesktopRegion::Iterator it(frame->updated_region());
   ASSERT_TRUE(!it.IsAtEnd());
   EXPECT_TRUE(it.rect().equals(DesktopRect::MakeSize(frame->size())));
   it.Advance();
   EXPECT_TRUE(it.IsAtEnd());
 }
 
@@ skipping 57 matching lines @@
       std::unique_ptr<SharedMemoryFactory>(new FakeSharedMemoryFactory()));
   capturer_->CaptureFrame();
   ASSERT_TRUE(frame);
   ASSERT_TRUE(frame->shared_memory());
   EXPECT_EQ(frame->shared_memory()->id(), kTestSharedMemoryId);
 }
 
 #endif  // defined(WEBRTC_WIN)
 
 }  // namespace webrtc