Make BeforeInstallPromptEvent cancelable

third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp

Index: third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp
diff --git a/third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp b/third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp
index 27911600b8efe6b80004bf13f7c3f64b4c04fbc3..096767aa483bbcc827a3c9795c2b2533e6a2b419 100644
--- a/third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp
+++ b/third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp
@@ -35,7 +35,7 @@ BeforeInstallPromptEvent::BeforeInstallPromptEvent(
 BeforeInstallPromptEvent::BeforeInstallPromptEvent(
     const AtomicString& name,
     const BeforeInstallPromptEventInit& init)
-    : Event(name, false, true), binding_(this), prompt_called_(false) {
+    : Event(name, init), binding_(this), prompt_called_(false) {
   if (init.hasPlatforms())
     platforms_ = init.platforms();
 }