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

extensions/common/extension.cc

Index: extensions/common/extension.cc
diff --git a/extensions/common/extension.cc b/extensions/common/extension.cc
index d8e798e516e2795c50f670fd27a6b26e4a1ed6e9..815127f6d3bfcd43d4e1f4e07a3041d91eed0c5b 100644
--- a/extensions/common/extension.cc
+++ b/extensions/common/extension.cc
@@ -114,12 +114,12 @@ scoped_refptr<Extension> Extension::Create(const base::FilePath& path,
 
   if (!InitExtensionID(manifest.get(), path, explicit_id, flags, &error)) {
     *utf8_error = base::UTF16ToUTF8(error);
-    return NULL;
+    return nullptr;
   }
 
   std::vector<InstallWarning> install_warnings;
   if (!manifest->ValidateManifest(utf8_error, &install_warnings)) {
-    return NULL;
+    return nullptr;
   }
 
   scoped_refptr<Extension> extension = new Extension(path, manifest.Pass());
@@ -127,7 +127,7 @@ scoped_refptr<Extension> Extension::Create(const base::FilePath& path,
 
   if (!extension->InitFromValue(flags, &error)) {
     *utf8_error = base::UTF16ToUTF8(error);
-    return NULL;
+    return nullptr;
   }
 
   return extension;
@@ -363,7 +363,7 @@ Extension::ManifestData* Extension::GetManifestData(const std::string& key)
   ManifestDataMap::const_iterator iter = manifest_data_.find(key);
   if (iter != manifest_data_.end())
     return iter->second.get();
-  return NULL;
+  return nullptr;
 }
 
 void Extension::SetManifestData(const std::string& key,
@@ -600,11 +600,11 @@ bool Extension::LoadExtent(const char* key,
                            const char* list_error,
                            const char* value_error,
                            base::string16* error) {
-  const base::Value* temp_pattern_value = NULL;
+  const base::Value* temp_pattern_value = nullptr;
   if (!manifest_->Get(key, &temp_pattern_value))
     return true;
 
-  const base::ListValue* pattern_list = NULL;
+  const base::ListValue* pattern_list = nullptr;
   if (!temp_pattern_value->GetAsList(&pattern_list)) {
     *error = base::ASCIIToUTF16(list_error);
     return false;