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

extensions/browser/api/bluetooth/bluetooth_event_router.cc

Index: extensions/browser/api/bluetooth/bluetooth_event_router.cc
diff --git a/extensions/browser/api/bluetooth/bluetooth_event_router.cc b/extensions/browser/api/bluetooth/bluetooth_event_router.cc
index 1064d0bdad177dc91b4e3dac3d5cd8f34e6a9b1b..fc90e88783cd5e8b363d25a41e105f1c5d0b214f 100644
--- a/extensions/browser/api/bluetooth/bluetooth_event_router.cc
+++ b/extensions/browser/api/bluetooth/bluetooth_event_router.cc
@@ -38,7 +38,7 @@ namespace bt_private = core_api::bluetooth_private;
 
 BluetoothEventRouter::BluetoothEventRouter(content::BrowserContext* context)
     : browser_context_(context),
-      adapter_(NULL),
+      adapter_(nullptr),
       num_event_listeners_(0),
       extension_registry_observer_(this),
       weak_ptr_factory_(this) {
@@ -54,7 +54,7 @@ BluetoothEventRouter::~BluetoothEventRouter() {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   if (adapter_.get()) {
     adapter_->RemoveObserver(this);
-    adapter_ = NULL;
+    adapter_ = nullptr;
   }
   CleanUpAllExtensions();
 }
@@ -122,7 +122,7 @@ BluetoothApiPairingDelegate* BluetoothEventRouter::GetPairingDelegate(
     const std::string& extension_id) {
   return ContainsKey(pairing_delegate_map_, extension_id)
              ? pairing_delegate_map_[extension_id]
-             : NULL;
+             : nullptr;
 }
 
 void BluetoothEventRouter::OnAdapterInitialized(
@@ -140,7 +140,7 @@ void BluetoothEventRouter::MaybeReleaseAdapter() {
   if (adapter_.get() && num_event_listeners_ == 0 &&
       pairing_delegate_map_.empty()) {
     adapter_->RemoveObserver(this);
-    adapter_ = NULL;
+    adapter_ = nullptr;
   }
 }