Removed constructor typings which can't be used

Also corrected some parameter names.

Author: gmoothart

src/lib/es2015.collection.d.ts

@@ -1,7 +1,7 @@
 interface Map<K, V> {
     clear(): void;
     delete(key: K): boolean;
-    forEach(callbackfn: (value: V, index: K, map: Map<K, V>) => void, thisArg?: any): void;
+    forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: any): void;
     get(key: K): V | undefined;
     has(key: K): boolean;
     set(key: K, value?: V): this;
@@ -17,19 +17,13 @@ declare var Map: MapConstructor;
 
 interface ReadonlyMap<K, V> {
   forEach(
-      callbackfn: (value: V, index: K, map: ReadonlyMap<K, V>) => void,
+      callbackfn: (value: V, key: K, map: ReadonlyMap<K, V>) => void,
       thisArg?: any): void;
   get(key: K): V|undefined;
   has(key: K): boolean;
   readonly size: number;
 }
 
-interface ReadonlyMapConstructor {
-  new<K, V>(entries?: [K, V][]): ReadonlyMap<K, V>;
-  readonly prototype: ReadonlyMap<any, any>;
-}
-declare var ReadonlyMap: ReadonlyMapConstructor;
-
 interface WeakMap<K, V> {
     delete(key: K): boolean;
     get(key: K): V | undefined;
@@ -48,7 +42,7 @@ interface Set<T> {
     add(value: T): this;
     clear(): void;
     delete(value: T): boolean;
-    forEach(callbackfn: (value: T, index: T, set: Set<T>) => void, thisArg?: any): void;
+    forEach(callbackfn: (value: T, value2: T, set: Set<T>) => void, thisArg?: any): void;
     has(value: T): boolean;
     readonly size: number;
 }
@@ -61,18 +55,12 @@ interface SetConstructor {
 declare var Set: SetConstructor;
 
 interface ReadonlySet<T> {
-  forEach(callbackfn: (value: T, index: T, set: ReadonlySet<T>) => void, thisArg?: any):
+  forEach(callbackfn: (value: T, value2: T, set: ReadonlySet<T>) => void, thisArg?: any):
       void;
   has(value: T): boolean;
   readonly size: number;
 }
 
-interface ReadonlySetConstructor {
-  new<T>(values?: T[]): ReadonlySet<T>;
-  readonly prototype: ReadonlySet<any>;
-}
-declare var ReadonlySet: ReadonlySetConstructor;
-
 interface WeakSet<T> {
     add(value: T): this;
     delete(value: T): boolean;