Change beforeinstallprompt event to take an array of platforms.

Source/modules/app_banner/BeforeInstallPromptEvent.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/app_banner/BeforeInstallPromptEvent.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/app_banner/BeforeInstallPromptEventInit.h"
 
 namespace blink {
 
 BeforeInstallPromptEvent::BeforeInstallPromptEvent()
 {
 }
 
-BeforeInstallPromptEvent::BeforeInstallPromptEvent(const AtomicString& name, const String& platform)
+BeforeInstallPromptEvent::BeforeInstallPromptEvent(const AtomicString& name, const Vector<String>& platforms)
     : Event(name, false, true)
-    , m_platform(platform)
+    , m_platforms(platforms)
 {
 }
 
 BeforeInstallPromptEvent::BeforeInstallPromptEvent(const AtomicString& name, const BeforeInstallPromptEventInit& init)
     : Event(name, false, true)
-    , m_platform(init.platform())
+    , m_platforms(init.platforms())
 {
 }
 
 BeforeInstallPromptEvent::~BeforeInstallPromptEvent()
 {
 }
 
-String BeforeInstallPromptEvent::platform() const
+Vector<String> BeforeInstallPromptEvent::platforms() const
 {
-    return m_platform;
+    return m_platforms;
 }
 
 ScriptPromise BeforeInstallPromptEvent::userChoice(ScriptState* scriptState) const
 {
     return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(NotSupportedError, "Subscription failed - no active Service Worker"));
 }
 
 const AtomicString& BeforeInstallPromptEvent::interfaceName() const
 {
     return EventNames::BeforeInstallPromptEvent;
 }
 
 } // namespace blink