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

extensions/browser/api/web_request/web_request_api_helpers.cc

Index: extensions/browser/api/web_request/web_request_api_helpers.cc
diff --git a/extensions/browser/api/web_request/web_request_api_helpers.cc b/extensions/browser/api/web_request/web_request_api_helpers.cc
index 29de9b6953e037cddb4932061fa54f1ae5b65a0b..0abf1657cc979fe7a1637f6ae52727fb12cefce6 100644
--- a/extensions/browser/api/web_request/web_request_api_helpers.cc
+++ b/extensions/browser/api/web_request/web_request_api_helpers.cc
@@ -302,7 +302,7 @@ EventResponseDelta* CalculateOnHeadersReceivedDelta(
 
   // Find deleted headers (header keys are treated case insensitively).
   {
-    void* iter = NULL;
+    void* iter = nullptr;
     std::string name;
     std::string value;
     while (old_response_headers->EnumerateHeaderLines(&iter, &name, &value)) {
@@ -327,7 +327,7 @@ EventResponseDelta* CalculateOnHeadersReceivedDelta(
   {
     for (ResponseHeaders::const_iterator i = new_response_headers->begin();
          i != new_response_headers->end(); ++i) {
-      void* iter = NULL;
+      void* iter = nullptr;
       std::string value;
       bool header_found = false;
       while (old_response_headers->EnumerateHeader(&iter, i->first, &value) &&
@@ -759,7 +759,7 @@ static ParsedResponseCookies GetResponseCookies(
     scoped_refptr<net::HttpResponseHeaders> override_response_headers) {
   ParsedResponseCookies result;
 
-  void* iter = NULL;
+  void* iter = nullptr;
   std::string value;
   while (override_response_headers->EnumerateHeader(&iter, "Set-Cookie",
                                                     &value)) {
@@ -961,7 +961,7 @@ void MergeCookiesInOnHeadersReceivedResponses(
     return;
 
   // Only create a copy if we really want to modify the response headers.
-  if (override_response_headers->get() == NULL) {
+  if (override_response_headers->get() == nullptr) {
     *override_response_headers = new net::HttpResponseHeaders(
         original_response_headers->raw_headers());
   }
@@ -1028,7 +1028,7 @@ void MergeOnHeadersReceivedResponses(
     }
 
     // Only create a copy if we really want to modify the response headers.
-    if (override_response_headers->get() == NULL) {
+    if (override_response_headers->get() == nullptr) {
       *override_response_headers = new net::HttpResponseHeaders(
           original_response_headers->raw_headers());
     }
@@ -1096,7 +1096,7 @@ void MergeOnHeadersReceivedResponses(
       deltas, &new_url, conflicting_extensions, net_log);
   if (new_url.is_valid()) {
     // Only create a copy if we really want to modify the response headers.
-    if (override_response_headers->get() == NULL) {
+    if (override_response_headers->get() == nullptr) {
       *override_response_headers = new net::HttpResponseHeaders(
           original_response_headers->raw_headers());
     }