Remove private Angular API usage

[IgorMinar]

When testing Angular 4 in google3 we discovered that flex-layout uses private APIs from @angular/core. These apis are no longer available in A4. Please remove the usage:

flex-layout/src/lib/flexbox/api/base.ts

Lines 10 to 11 in f9f16f5

	import {__platform_browser_private__} from '@angular/platform-browser';
	const getDOM = __platform_browser_private__.getDOM;

flex-layout/src/lib/flexbox/api/base.ts

Line 95 in f9f16f5

let value = (element.style as any)['display'] || getDOM().getComputedStyle(element)['display'];

in google3 we made the following local modification:

before:

import {ElementRef, Renderer, OnDestroy} from '@angular/core';

import {__platform_browser_private__} from '@angular/platform-browser';
const getDOM = __platform_browser_private__.getDOM;

import {applyCssPrefixes} from '../../utils/auto-prefixer';

...

    let value = (element.style as any)['display'] || getDOM().getComputedStyle(element)['display'];

after:

import {ElementRef, Renderer, OnDestroy} from '@angular/core';

import {applyCssPrefixes} from '../../utils/auto-prefixer';

...

    let value = (element.style as any)['display'] || getComputedStyle(element)['display'];

please note that the global window object has getComputedStyle which getDOM delegated the call, so this modification is equivalent to the original both at design time and at run time.

[ThomasBurleson]

@IgorMinar - Can you provide some insight how Angular Universal addresses calls such as the previous getDOM() and now the implicit window.getComputedStyle(....) ?

Darn it... you beat us to this effort. Notice we already had #191: "Publish a version supporting Angular 4.x" in the queue.

[ThomasBurleson]

Refs #191

[IgorMinar]

@vikerman can help with the universal support question.

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