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

extensions/browser/computed_hashes.cc

Index: extensions/browser/computed_hashes.cc
diff --git a/extensions/browser/computed_hashes.cc b/extensions/browser/computed_hashes.cc
index 3c89770e0f282162580e67592c64fa51a66b6e03..8b00f62191ac47941df4ff23168823806afeffe6 100644
--- a/extensions/browser/computed_hashes.cc
+++ b/extensions/browser/computed_hashes.cc
@@ -36,7 +36,7 @@ bool ComputedHashes::Reader::InitFromFile(const base::FilePath& path) {
   if (!base::ReadFileToString(path, &contents))
     return false;
 
-  base::DictionaryValue* top_dictionary = NULL;
+  base::DictionaryValue* top_dictionary = nullptr;
   scoped_ptr<base::Value> value(base::JSONReader::Read(contents));
   if (!value.get() || !value->GetAsDictionary(&top_dictionary))
     return false;
@@ -47,12 +47,12 @@ bool ComputedHashes::Reader::InitFromFile(const base::FilePath& path) {
   if (!top_dictionary->GetInteger(kVersionKey, &version) || version != kVersion)
     return false;
 
-  base::ListValue* all_hashes = NULL;
+  base::ListValue* all_hashes = nullptr;
   if (!top_dictionary->GetList(kFileHashesKey, &all_hashes))
     return false;
 
   for (size_t i = 0; i < all_hashes->GetSize(); i++) {
-    base::DictionaryValue* dictionary = NULL;
+    base::DictionaryValue* dictionary = nullptr;
     if (!all_hashes->GetDictionary(i, &dictionary))
       return false;
 
@@ -69,7 +69,7 @@ bool ComputedHashes::Reader::InitFromFile(const base::FilePath& path) {
       return false;
     }
 
-    base::ListValue* hashes_list = NULL;
+    base::ListValue* hashes_list = nullptr;
     if (!dictionary->GetList(kBlockHashesKey, &hashes_list))
       return false;