Use V8 Maybe APIs in extensions/renderer

extensions/renderer/module_system_test.cc

Index: extensions/renderer/module_system_test.cc
diff --git a/extensions/renderer/module_system_test.cc b/extensions/renderer/module_system_test.cc
index 04de2b1a45ec5219b7ef52207365aa31b4b64750..1672548feaf513201318f03e27de80471ecac17c 100644
--- a/extensions/renderer/module_system_test.cc
+++ b/extensions/renderer/module_system_test.cc
@@ -27,8 +27,10 @@ namespace {
 
 class FailsOnException : public ModuleSystem::ExceptionHandler {
  public:
+  FailsOnException() : ModuleSystem::ExceptionHandler(NULL) {}
   void HandleUncaughtException(const v8::TryCatch& try_catch) override {
-    FAIL() << "Uncaught exception: " << CreateExceptionString(try_catch);
+    FAIL() << "Uncaught exception: "
+           << CreateExceptionString(try_catch);
   }
 };