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

extensions/browser/api/sockets_udp/sockets_udp_api.cc

Index: extensions/browser/api/sockets_udp/sockets_udp_api.cc
diff --git a/extensions/browser/api/sockets_udp/sockets_udp_api.cc b/extensions/browser/api/sockets_udp/sockets_udp_api.cc
index d213ffddbe2f707f850d1bfd9e4446a6c43cbe97..09eb01dbd64d16894b8667ec67864f19d54613a7 100644
--- a/extensions/browser/api/sockets_udp/sockets_udp_api.cc
+++ b/extensions/browser/api/sockets_udp/sockets_udp_api.cc
@@ -132,7 +132,8 @@ void SocketsUdpUpdateFunction::Work() {
 }
 
 SocketsUdpSetPausedFunction::SocketsUdpSetPausedFunction()
-    : socket_event_dispatcher_(NULL) {}
+    : socket_event_dispatcher_(nullptr) {
+}
 
 SocketsUdpSetPausedFunction::~SocketsUdpSetPausedFunction() {}
 
@@ -146,7 +147,7 @@ bool SocketsUdpSetPausedFunction::Prepare() {
          "If this assertion is failing during a test, then it is likely that "
          "TestExtensionSystem is failing to provide an instance of "
          "UDPSocketEventDispatcher.";
-  return socket_event_dispatcher_ != NULL;
+  return socket_event_dispatcher_ != nullptr;
 }
 
 void SocketsUdpSetPausedFunction::Work() {
@@ -168,7 +169,8 @@ void SocketsUdpSetPausedFunction::Work() {
 }
 
 SocketsUdpBindFunction::SocketsUdpBindFunction()
-    : socket_event_dispatcher_(NULL) {}
+    : socket_event_dispatcher_(nullptr) {
+}
 
 SocketsUdpBindFunction::~SocketsUdpBindFunction() {}
 
@@ -182,7 +184,7 @@ bool SocketsUdpBindFunction::Prepare() {
          "If this assertion is failing during a test, then it is likely that "
          "TestExtensionSystem is failing to provide an instance of "
          "UDPSocketEventDispatcher.";
-  return socket_event_dispatcher_ != NULL;
+  return socket_event_dispatcher_ != nullptr;
 }
 
 void SocketsUdpBindFunction::Work() {
@@ -341,7 +343,7 @@ bool SocketsUdpGetSocketsFunction::Prepare() { return true; }
 void SocketsUdpGetSocketsFunction::Work() {
   std::vector<linked_ptr<sockets_udp::SocketInfo> > socket_infos;
   base::hash_set<int>* resource_ids = GetSocketIds();
-  if (resource_ids != NULL) {
+  if (resource_ids != nullptr) {
     for (base::hash_set<int>::iterator it = resource_ids->begin();
          it != resource_ids->end();
          ++it) {