Remove dependency on NodeJS definitions

base/base_inner.ts

@@ -1,4 +1,4 @@
-  class EventEmitter extends NodeJS.EventEmitter {
+  class EventEmitter {
     addListener(event: string, listener: Function): this;
     on(event: string, listener: Function): this;
     once(event: string, listener: Function): this;
@@ -9,6 +9,9 @@
     listeners(event: string): Function[];
     emit(event: string, ...args: any[]): boolean;
     listenerCount(type: string): number;
+    prependListener(event: string, listener: Function): this;
+    prependOnceListener(event: string, listener: Function): this;
+    eventNames(): string[];
   }
 
   class Accelerator extends String {
@@ -19,4 +22,4 @@
     preventDefault: Function;
     sender: WebContents;
     returnValue?: any;
-  }
+  }