Import PortalModule from cdk directly (#280)

Author: kara

src/app/shared/doc-viewer/doc-viewer-module.ts

@@ -7,8 +7,8 @@ import {
   MatTabsModule,
   MatTooltipModule,
   MatSnackBarModule,
-  PortalModule
 } from '@angular/material';
+import {PortalModule} from '@angular/cdk/portal';
 import {CommonModule} from '@angular/common';
 import {NgModule} from '@angular/core';
 import {HeaderLink} from './header-link';

src/app/shared/doc-viewer/doc-viewer.ts

@@ -11,10 +11,10 @@ import {
   Output,
 } from '@angular/core';
 import {Http} from '@angular/http';
-import {ComponentPortal, DomPortalHost} from '@angular/material';
 import {Subscription} from 'rxjs/Subscription';
 import {ExampleViewer} from '../example-viewer/example-viewer';
 import {HeaderLink} from './header-link';
+import {ComponentPortal, DomPortalHost} from '@angular/cdk/portal';
 
 @Component({
   selector: 'doc-viewer',

src/app/shared/example-viewer/example-viewer.ts

@@ -1,5 +1,6 @@
 import {Component, Input} from '@angular/core';
-import {ComponentPortal, MatSnackBar} from '@angular/material';
+import {MatSnackBar} from '@angular/material';
+import {ComponentPortal} from '@angular/cdk/portal';
 import 'rxjs/add/operator/first';
 
 import {EXAMPLE_COMPONENTS, LiveExample} from '@angular/material-examples';