Replace NULL with nullptr in all C++ files.

webrtc/modules/rtp_rtcp/source/vp8_partition_aggregator_unittest.cc

Index: webrtc/modules/rtp_rtcp/source/vp8_partition_aggregator_unittest.cc
diff --git a/webrtc/modules/rtp_rtcp/source/vp8_partition_aggregator_unittest.cc b/webrtc/modules/rtp_rtcp/source/vp8_partition_aggregator_unittest.cc
index 6413d60fc0c6dca96ad5751fbb642c0bf80c7757..006b5e6e68b9e406623258d75f337c3ec1cca0db 100644
--- a/webrtc/modules/rtp_rtcp/source/vp8_partition_aggregator_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/vp8_partition_aggregator_unittest.cc
@@ -8,7 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include <stdlib.h>  // NULL
+#include <stdlib.h>  // nullptr
 
 #include "webrtc/modules/rtp_rtcp/source/vp8_partition_aggregator.h"
 #include "webrtc/test/gtest.h"
@@ -34,8 +34,8 @@ TEST(PartitionTreeNode, CreateChildrenAndDelete) {
   PartitionTreeNode* root =
       PartitionTreeNode::CreateRootNode(kVector, kNumPartitions);
   EXPECT_TRUE(root->CreateChildren(kMaxSize));
-  ASSERT_TRUE(NULL != root->left_child());
-  ASSERT_TRUE(NULL != root->right_child());
+  ASSERT_TRUE(nullptr != root->left_child());
+  ASSERT_TRUE(nullptr != root->right_child());
   EXPECT_EQ(3u, root->left_child()->this_size());
   EXPECT_EQ(2u, root->right_child()->this_size());
   EXPECT_EQ(11, root->right_child()->Cost(kPenalty));
@@ -54,7 +54,7 @@ TEST(PartitionTreeNode, FindOptimalConfig) {
   root->set_max_parent_size(500);
   root->set_min_parent_size(300);
   PartitionTreeNode* opt = root->GetOptimalNode(kMaxSize, kPenalty);
-  ASSERT_TRUE(opt != NULL);
+  ASSERT_TRUE(opt != nullptr);
   EXPECT_EQ(4u, opt->NumPackets());
   // Expect optimal sequence to be {1, 0, 1, 0, 1, 0, 1, 0}, which corresponds
   // to (right)-left-right-left-right-left-right-left, where the root node is
@@ -83,7 +83,7 @@ TEST(PartitionTreeNode, FindOptimalConfigSinglePartition) {
   PartitionTreeNode* root =
       PartitionTreeNode::CreateRootNode(kVector, kNumPartitions);
   PartitionTreeNode* opt = root->GetOptimalNode(kMaxSize, kPenalty);
-  ASSERT_TRUE(opt != NULL);
+  ASSERT_TRUE(opt != nullptr);
   EXPECT_EQ(1u, opt->NumPackets());
   EXPECT_TRUE(opt == root);
   delete root;