refactor(intl facade): remove outdated code

modules/@angular/facade/src/intl.ts

@@ -1,46 +1,3 @@
-
-// Modified version of internal Typescript intl.d.ts.
-// TODO(piloopin): remove when https://github.com/Microsoft/TypeScript/issues/3521 is shipped.
-declare module Intl {
-  interface NumberFormatOptions {
-    localeMatcher?: string;
-    style?: string;
-    currency?: string;
-    currencyDisplay?: string;
-    useGrouping?: boolean;
-    minimumIntegerDigits?: number;
-    minimumFractionDigits?: number;
-    maximumFractionDigits?: number;
-  }
-
-  interface NumberFormat {
-    format(value: number): string;
-  }
-
-  var NumberFormat: {new (locale?: string, options?: NumberFormatOptions): NumberFormat};
-
-  interface DateTimeFormatOptions {
-    localeMatcher?: string;
-    weekday?: string;
-    era?: string;
-    year?: string;
-    month?: string;
-    day?: string;
-    hour?: string;
-    minute?: string;
-    second?: string;
-    timeZoneName?: string;
-    formatMatcher?: string;
-    hour12?: boolean;
-  }
-
-  interface DateTimeFormat {
-    format(date?: Date | number): string;
-  }
-
-  var DateTimeFormat: {new (locale?: string, options?: DateTimeFormatOptions): DateTimeFormat};
-}
-
 export enum NumberFormatStyle {
   Decimal,
   Percent,