Convert utility process extension Unpacker IPC to mojo

chrome/utility/extensions/extensions_handler.cc

Index: chrome/utility/extensions/extensions_handler.cc
diff --git a/chrome/utility/extensions/extensions_handler.cc b/chrome/utility/extensions/extensions_handler.cc
index 4cb3fa887f6fb7d0f8fe385a489573f8e18e2c53..d13da7411cb1f26ad5c81f7d02d7d48380e34177 100644
--- a/chrome/utility/extensions/extensions_handler.cc
+++ b/chrome/utility/extensions/extensions_handler.cc
@@ -176,8 +176,7 @@ ExtensionsHandler::ExtensionsHandler() {
   ExtensionsClient::Set(ChromeExtensionsClient::GetInstance());
 }
 
-ExtensionsHandler::~ExtensionsHandler() {
-}
+ExtensionsHandler::~ExtensionsHandler() = default;
 
 // static
 void ExtensionsHandler::PreSandboxStartup() {
@@ -186,9 +185,15 @@ void ExtensionsHandler::PreSandboxStartup() {
 }
 
 // static
+void ExtensionsHandler::UtilityThreadStarted() {
+  UtilityHandler::UtilityThreadStarted();
+}
+
+// static
 void ExtensionsHandler::ExposeInterfacesToBrowser(
     service_manager::InterfaceRegistry* registry,
     bool running_elevated) {
+  UtilityHandler::ExposeInterfacesToBrowser(registry, running_elevated);
   // If our process runs with elevated privileges, only add elevated Mojo
   // services to the interface registry.
   if (running_elevated) {