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

extensions/browser/api/declarative_webrequest/webrequest_condition.cc

Index: extensions/browser/api/declarative_webrequest/webrequest_condition.cc
diff --git a/extensions/browser/api/declarative_webrequest/webrequest_condition.cc b/extensions/browser/api/declarative_webrequest/webrequest_condition.cc
index 28c28ce7d54311da583f4fb9ff350d3b53269e89..853c96778f5d7fae051a721a9dfcb9da6ea2abe5 100644
--- a/extensions/browser/api/declarative_webrequest/webrequest_condition.cc
+++ b/extensions/browser/api/declarative_webrequest/webrequest_condition.cc
@@ -46,9 +46,8 @@ namespace keys = declarative_webrequest_constants;
 //
 
 WebRequestData::WebRequestData(net::URLRequest* request, RequestStage stage)
-    : request(request),
-      stage(stage),
-      original_response_headers(NULL) {}
+    : request(request), stage(stage), original_response_headers(nullptr) {
+}
 
 WebRequestData::WebRequestData(
     net::URLRequest* request,
@@ -130,7 +129,7 @@ scoped_ptr<WebRequestCondition> WebRequestCondition::Create(
     URLMatcherConditionFactory* url_matcher_condition_factory,
     const base::Value& condition,
     std::string* error) {
-  const base::DictionaryValue* condition_dict = NULL;
+  const base::DictionaryValue* condition_dict = nullptr;
   if (!condition.GetAsDictionary(&condition_dict)) {
     *error = kExpectedDictionary;
     return scoped_ptr<WebRequestCondition>();
@@ -160,7 +159,7 @@ scoped_ptr<WebRequestCondition> WebRequestCondition::Create(
       // Skip this.
     } else if (name_is_url ||
                condition_attribute_name == keys::kFirstPartyForCookiesUrlKey) {
-      const base::DictionaryValue* dict = NULL;
+      const base::DictionaryValue* dict = nullptr;
       if (!condition_attribute_value.GetAsDictionary(&dict)) {
         *error = base::StringPrintf(kInvalidTypeOfParamter,
                                     condition_attribute_name.c_str());