diff --git a/chrome/chrome-app.d.ts b/chrome/chrome-app.d.ts
index d40fa3b2d7..53ab44e292 100644
--- a/chrome/chrome-app.d.ts
+++ b/chrome/chrome-app.d.ts
@@ -1,8 +1,9 @@
-// Type definitions for Chrome packaged application development
+// Type definitions for Chrome packaged application development
 // Project: http://developer.chrome.com/apps/
 // Definitions by: Adam Lay <https://github.com/AdamLay>, MIZUNE Pine <https://github.com/pine613>, MIZUSHIMA Junki <https://github.com/mzsm>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
+/// <reference path="chrome.d.ts"/>
 /// <reference path='../filesystem/filesystem.d.ts'/>
 
 ////////////////////
@@ -22,13 +23,9 @@ declare module chrome.app.runtime {
         type: string;
     }
 
-    interface LaunchedEvent {
-        addListener(callback: (launchData: LaunchData) => void): void;
-    }
+    interface LaunchedEvent extends chrome.events.Event<(launchData: LaunchData) => void> {}
 
-    interface RestartedEvent {
-        addListener(callback: () => void): void;
-    }
+    interface RestartedEvent extends chrome.events.Event<() => void> {}
 
     var onLaunched: LaunchedEvent;
     var onRestarted: RestartedEvent;
@@ -136,10 +133,7 @@ declare module chrome.app.window {
     export function getAll(): AppWindow[];
     export function canSetVisibleOnAllWorkspaces(): boolean;
 
-    interface WindowEvent {
-        addListener(callback: () => void): void;
-        removeListener(callback: () => void): void;
-    }
+    interface WindowEvent extends chrome.events.Event<() => void> {}
 
     var onBoundsChanged: WindowEvent;
     var onClosed: WindowEvent;
@@ -154,20 +148,6 @@ declare module chrome.app.window {
 ////////////////////
 declare module chrome.fileSystem {
 
-    interface ChildChangeInfo {
-        entry: Entry;
-        type: string;
-    }
-
-    interface EntryChangedEvent {
-        target: Entry;
-        childChanges?: ChildChangeInfo[];
-    }
-
-    interface EntryRemovedEvent {
-        target: Entry;
-    }
-
     interface AcceptOptions {
         description?: string;
         mimeTypes?: string[];
@@ -207,10 +187,6 @@ declare module chrome.sockets.tcp {
         bytesSent?: number;
     }
 
-    interface Event<T> {
-        addListener(callback: (info: T) => void): void;
-    }
-
     interface ReceiveEventArgs {
         socketId: number;
         data: ArrayBuffer;
@@ -260,8 +236,8 @@ declare module chrome.sockets.tcp {
     export function getInfo(socketId: number, callback: (socketInfo: SocketInfo) => void): void;
     export function getSockets(socketId: number, callback: (socketInfos: SocketInfo[]) => void): void;
 
-    var onReceive: Event<ReceiveEventArgs>;
-    var onReceiveError: Event<ReceiveErrorEventArgs>;
+    var onReceive: chrome.events.Event<(args: ReceiveEventArgs) => void>;
+    var onReceiveError: chrome.events.Event<(args: ReceiveErrorEventArgs) => void>;
 }
 
 declare module chrome.sockets.udp {
@@ -274,10 +250,6 @@ declare module chrome.sockets.udp {
         bytesSent?: number;
     }
 
-    interface Event<T> {
-        addListener(callback: (info: T) => void): void;
-    }
-
     interface ReceiveEventArgs {
         socketId: number;
         data: ArrayBuffer;
@@ -323,8 +295,8 @@ declare module chrome.sockets.udp {
     export function setMulticastLoopbackMode(socketId: number, enabled: boolean, callback: (result: number) => void): void;
     export function getJoinedGroups(socketId: number, callback: (groups: string[]) => void): void;
 
-    var onReceive: Event<ReceiveEventArgs>;
-    var onReceiveError: Event<ReceiveErrorEventArgs>;
+    var onReceive: chrome.events.Event<(args: ReceiveEventArgs) => void>;
+    var onReceiveError: chrome.events.Event<(args: ReceiveErrorEventArgs) => void>;
 }
 
 declare module chrome.sockets.tcpServer {
@@ -332,10 +304,6 @@ declare module chrome.sockets.tcpServer {
         socketId: number;
     }
 
-    interface Event<T> {
-        addListener(callback: (info: T) => void): void;
-    }
-
     interface AcceptEventArgs {
         socketId: number;
         clientSocketId: number;
@@ -375,8 +343,8 @@ declare module chrome.sockets.tcpServer {
     export function close(socketId: number, callback?: () => void): void;
     export function getInfo(socketId: number, callback: (socketInfos: SocketInfo[]) => void): void;
 
-    var onAccept: Event<AcceptEventArgs>;
-    var onAcceptError: Event<AcceptErrorEventArgs>;
+    var onAccept: chrome.events.Event<(args: AcceptEventArgs) => void>;
+    var onAcceptError: chrome.events.Event<(args: AcceptErrorEventArgs) => void>;
 }
 
 ////////////////////