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

extensions/browser/mock_extension_system.cc

Index: extensions/browser/mock_extension_system.cc
diff --git a/extensions/browser/mock_extension_system.cc b/extensions/browser/mock_extension_system.cc
index 8e1902f0cb239cdc9e1888143f40f07c9bef22b7..0d11cedb82c0d000f172023db15b03398ccccd20 100644
--- a/extensions/browser/mock_extension_system.cc
+++ b/extensions/browser/mock_extension_system.cc
@@ -23,63 +23,63 @@ void MockExtensionSystem::InitForRegularProfile(bool extensions_enabled) {
 }
 
 ExtensionService* MockExtensionSystem::extension_service() {
-  return NULL;
+  return nullptr;
 }
 
 RuntimeData* MockExtensionSystem::runtime_data() {
-  return NULL;
+  return nullptr;
 }
 
 ManagementPolicy* MockExtensionSystem::management_policy() {
-  return NULL;
+  return nullptr;
 }
 
 SharedUserScriptMaster* MockExtensionSystem::shared_user_script_master() {
-  return NULL;
+  return nullptr;
 }
 
 ProcessManager* MockExtensionSystem::process_manager() {
-  return NULL;
+  return nullptr;
 }
 
 StateStore* MockExtensionSystem::state_store() {
-  return NULL;
+  return nullptr;
 }
 
 StateStore* MockExtensionSystem::rules_store() {
-  return NULL;
+  return nullptr;
 }
 
 InfoMap* MockExtensionSystem::info_map() {
-  return NULL;
+  return nullptr;
 }
 
 LazyBackgroundTaskQueue* MockExtensionSystem::lazy_background_task_queue() {
-  return NULL;
+  return nullptr;
 }
 
 EventRouter* MockExtensionSystem::event_router() {
-  return NULL;
+  return nullptr;
 }
 
 WarningService* MockExtensionSystem::warning_service() {
-  return NULL;
+  return nullptr;
 }
 
 Blacklist* MockExtensionSystem::blacklist() {
-  return NULL;
+  return nullptr;
 }
 
 ErrorConsole* MockExtensionSystem::error_console() {
-  return NULL;
+  return nullptr;
 }
 
 InstallVerifier* MockExtensionSystem::install_verifier() {
-  return NULL;
+  return nullptr;
 }
 
 QuotaService* MockExtensionSystem::quota_service() {
-  return NULL;
+  return nullptr;
 }
 
 const OneShotEvent& MockExtensionSystem::ready() const {
@@ -87,13 +87,13 @@ const OneShotEvent& MockExtensionSystem::ready() const {
 }
 
 ContentVerifier* MockExtensionSystem::content_verifier() {
-  return NULL;
+  return nullptr;
 }
 
 DeclarativeUserScriptMaster*
       MockExtensionSystem::GetDeclarativeUserScriptMasterByExtension(
           const ExtensionId& extension_id) {
-  return NULL;
+  return nullptr;
 }
 
 scoped_ptr<ExtensionSet> MockExtensionSystem::GetDependentExtensions(