Replace NULL with nullptr in all C++ files.

webrtc/modules/desktop_capture/desktop_region_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 25 matching lines @@
     it.Advance();
   }
   EXPECT_TRUE(it.IsAtEnd());
 }
 
 }  // namespace
 
 // Verify that regions are empty when created.
 TEST(DesktopRegionTest, Empty) {
   DesktopRegion r;
-  CompareRegion(r, NULL, 0);
+  CompareRegion(r, nullptr, 0);
 }
 
 // Verify that empty rectangles are ignored.
 TEST(DesktopRegionTest, AddEmpty) {
   DesktopRegion r;
   DesktopRect rect = DesktopRect::MakeXYWH(1, 2, 0, 0);
   r.AddRect(rect);
-  CompareRegion(r, NULL, 0);
+  CompareRegion(r, nullptr, 0);
 }
 
 // Verify that regions with a single rectangles are handled properly.
 TEST(DesktopRegionTest, SingleRect) {
   DesktopRegion r;
   DesktopRect rect = DesktopRect::MakeXYWH(1, 2, 3, 4);
   r.AddRect(rect);
   CompareRegion(r, &rect, 1);
 }
 
@@ skipping 636 matching lines @@
           5 + RadmonInt(10) * 5, 5 + RadmonInt(10) * 5));
     }
 
     // Iterate over the rectangles.
     for (DesktopRegion::Iterator it(r); !it.IsAtEnd(); it.Advance()) {
     }
   }
 }
 
 }  // namespace webrtc