fix(Location): make Location#platformStrategy:LocationStrategy property private

BREAKING CHANGE: Location#platformStrategy property was previously accidentaly exported as public

If any application requires access to the current location strategy, it should be accessed via DI instead
by injecting the LocationStrategy token.

The likelyhood of anyone actually depending on this property is very low.

Author: IgorMinar

modules/@angular/common/src/location/location.ts

@@ -52,18 +52,22 @@ export class Location {
   /** @internal */
   _baseHref: string;
 
-  constructor(public platformStrategy: LocationStrategy) {
-    var browserBaseHref = this.platformStrategy.getBaseHref();
+  /** @internal */
+  _platformStrategy: LocationStrategy;
+
+  constructor(platformStrategy: LocationStrategy) {
+    this._platformStrategy = platformStrategy;
+    var browserBaseHref = this._platformStrategy.getBaseHref();
     this._baseHref = Location.stripTrailingSlash(_stripIndexHtml(browserBaseHref));
-    this.platformStrategy.onPopState((ev) => {
+    this._platformStrategy.onPopState((ev) => {
       ObservableWrapper.callEmit(this._subject, {'url': this.path(), 'pop': true, 'type': ev.type});
     });
   }
 
   /**
    * Returns the normalized URL path.
    */
-  path(): string { return this.normalize(this.platformStrategy.path()); }
+  path(): string { return this.normalize(this._platformStrategy.path()); }
 
   /**
    * Normalizes the given path and compares to the current normalized path.
@@ -90,7 +94,7 @@ export class Location {
     if (url.length > 0 && !url.startsWith('/')) {
       url = '/' + url;
     }
-    return this.platformStrategy.prepareExternalUrl(url);
+    return this._platformStrategy.prepareExternalUrl(url);
   }
 
   // TODO: rename this method to pushState
@@ -99,26 +103,26 @@ export class Location {
    * new item onto the platform's history.
    */
   go(path: string, query: string = ''): void {
-    this.platformStrategy.pushState(null, '', path, query);
+    this._platformStrategy.pushState(null, '', path, query);
   }
 
   /**
    * Changes the browsers URL to the normalized version of the given URL, and replaces
    * the top item on the platform's history stack.
    */
   replaceState(path: string, query: string = ''): void {
-    this.platformStrategy.replaceState(null, '', path, query);
+    this._platformStrategy.replaceState(null, '', path, query);
   }
 
   /**
    * Navigates forward in the platform's history.
    */
-  forward(): void { this.platformStrategy.forward(); }
+  forward(): void { this._platformStrategy.forward(); }
 
   /**
    * Navigates back in the platform's history.
    */
-  back(): void { this.platformStrategy.back(); }
+  back(): void { this._platformStrategy.back(); }
 
   /**
    * Subscribe to the platform's `popState` events.

modules/@angular/common/testing/location_mock.ts

@@ -1,6 +1,7 @@
 import {Injectable, EventEmitter} from '@angular/core';
 import {ObservableWrapper} from '../src/facade/async';
 import {Location} from '../index';
+import {LocationStrategy} from "../src/location/location_strategy";
 
 /**
  * A spy for {@link Location} that allows tests to fire simulated location events.
@@ -16,6 +17,8 @@ export class SpyLocation implements Location {
   _subject: EventEmitter<any> = new EventEmitter();
   /** @internal */
   _baseHref: string = '';
+  /** @internal */
+  _platformStrategy: LocationStrategy = null;
 
   setInitialPath(url: string) { this._history[this._historyIndex].path = url; }
 
@@ -101,8 +104,6 @@ export class SpyLocation implements Location {
     return ObservableWrapper.subscribe(this._subject, onNext, onThrow, onReturn);
   }
 
-  // TODO: remove these once Location is an interface, and can be implemented cleanly
-  platformStrategy: any = null;
   normalize(url: string): string { return null; }
 }