Run clang-modernize -use-nullptr over src/extensions/.

extensions/browser/content_verify_job.cc

Index: extensions/browser/content_verify_job.cc
diff --git a/extensions/browser/content_verify_job.cc b/extensions/browser/content_verify_job.cc
index e7e8cab9dd69a7bdf4298876a6f8966138e167a6..99903784a010810ca94078cd6fd08fccdbf338dc 100644
--- a/extensions/browser/content_verify_job.cc
+++ b/extensions/browser/content_verify_job.cc
@@ -19,7 +19,7 @@ namespace extensions {
 
 namespace {
 
-ContentVerifyJob::TestDelegate* g_test_delegate = NULL;
+ContentVerifyJob::TestDelegate* g_test_delegate = nullptr;
 
 class ScopedElapsedTimer {
  public:
@@ -142,7 +142,7 @@ bool ContentVerifyJob::FinishBlock() {
 
   int block = current_block_++;
 
-  const std::string* expected_hash = NULL;
+  const std::string* expected_hash = nullptr;
   if (!hash_reader_->GetHashForBlock(block, &expected_hash) ||
       *expected_hash != final)
     return false;