fix: Remove "constructors" from interfaces

In the context of an interface "constructor" is just an identifier, not
a reserved word.

see: https://stackoverflow.com/questions/46969551

packages/core/services/google-maps-types.ts

@@ -2,7 +2,6 @@ export var google: any;
 
 export interface GoogleMap extends MVCObject {
   data?: Data;
-  constructor(el: HTMLElement, opts?: MapOptions): void;
   panTo(latLng: LatLng|LatLngLiteral): void;
   panBy(x: number, y: number): void;
   setZoom(zoom: number): void;
@@ -17,15 +16,13 @@ export interface GoogleMap extends MVCObject {
 }
 
 export interface LatLng {
-  constructor(lat: number, lng: number): void;
   lat(): number;
   lng(): number;
   toJSON(): any;
   toString(): string;
 }
 
 export interface Marker extends MVCObject {
-  constructor(options?: MarkerOptions): void;
   setMap(map: GoogleMap): void;
   setPosition(latLng: LatLng|LatLngLiteral): void;
   setTitle(title: string): void;
@@ -221,7 +218,6 @@ export interface MapTypeStyler {
 }
 
 export interface InfoWindow extends MVCObject {
-  constructor(opts?: InfoWindowOptions): void;
   close(): void;
   getContent(): string|Node;
   getPosition(): LatLng;
@@ -259,7 +255,6 @@ export interface MapsEventListener { remove(): void; }
 export interface Size {
   height: number;
   width: number;
-  constructor(width: number, height: number, widthUnit?: string, heightUnit?: string): void;
   equals(other: Size): boolean;
   toString(): string;
 }
@@ -434,7 +429,6 @@ export interface KmlMouseEvent extends MouseEvent {
 
 export interface Data extends MVCObject {
   features: Feature[];
-  constructor(options?: DataOptions): void;
   addGeoJson(geoJson: Object, options?: GeoJsonOptions): Feature[];
   remove(feature: Feature): void;
   setControlPosition(controlPosition: ControlPosition): void;