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

extensions/browser/api/sockets_tcp_server/sockets_tcp_server_api.cc

Index: extensions/browser/api/sockets_tcp_server/sockets_tcp_server_api.cc
diff --git a/extensions/browser/api/sockets_tcp_server/sockets_tcp_server_api.cc b/extensions/browser/api/sockets_tcp_server/sockets_tcp_server_api.cc
index a55d0b5e7383b69b4e90c0aba3e7117aeac57ee9..cc3f4cfc8537731abf0388e31f5c99b2632f71fa 100644
--- a/extensions/browser/api/sockets_tcp_server/sockets_tcp_server_api.cc
+++ b/extensions/browser/api/sockets_tcp_server/sockets_tcp_server_api.cc
@@ -121,7 +121,8 @@ void SocketsTcpServerUpdateFunction::Work() {
 }
 
 SocketsTcpServerSetPausedFunction::SocketsTcpServerSetPausedFunction()
-    : socket_event_dispatcher_(NULL) {}
+    : socket_event_dispatcher_(nullptr) {
+}
 
 SocketsTcpServerSetPausedFunction::~SocketsTcpServerSetPausedFunction() {}
 
@@ -136,7 +137,7 @@ bool SocketsTcpServerSetPausedFunction::Prepare() {
          "If this assertion is failing during a test, then it is likely that "
          "TestExtensionSystem is failing to provide an instance of "
          "TCPServerSocketEventDispatcher.";
-  return socket_event_dispatcher_ != NULL;
+  return socket_event_dispatcher_ != nullptr;
 }
 
 void SocketsTcpServerSetPausedFunction::Work() {
@@ -158,7 +159,8 @@ void SocketsTcpServerSetPausedFunction::Work() {
 }
 
 SocketsTcpServerListenFunction::SocketsTcpServerListenFunction()
-    : socket_event_dispatcher_(NULL) {}
+    : socket_event_dispatcher_(nullptr) {
+}
 
 SocketsTcpServerListenFunction::~SocketsTcpServerListenFunction() {}
 
@@ -173,7 +175,7 @@ bool SocketsTcpServerListenFunction::Prepare() {
          "If this assertion is failing during a test, then it is likely that "
          "TestExtensionSystem is failing to provide an instance of "
          "TCPServerSocketEventDispatcher.";
-  return socket_event_dispatcher_ != NULL;
+  return socket_event_dispatcher_ != nullptr;
 }
 
 void SocketsTcpServerListenFunction::Work() {
@@ -280,7 +282,7 @@ bool SocketsTcpServerGetSocketsFunction::Prepare() { return true; }
 void SocketsTcpServerGetSocketsFunction::Work() {
   std::vector<linked_ptr<sockets_tcp_server::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) {