fix(ngUpgrade): fix downgrade content projection and injector inherit…

…ance

- Full support for content projection in downgraded Angular 2
  components. In particular, this enables multi-slot projection and
  other features on <ng-content>.
- Correctly wire up hierarchical injectors for downgraded Angular 2
  components: downgraded components inherit the injector of the first
  other downgraded Angular 2 component they find up the DOM tree.

Closes angular#6629, angular#7727, angular#8729, angular#9643, angular#9649

modules/@angular/upgrade/src/runtime_compiler_spy.ts

@@ -8,7 +8,6 @@
 
 import {RuntimeCompilerFactory} from '@angular/compiler';
 import {COMPILER_OPTIONS, Compiler, CompilerOptions, Inject, Injectable} from '@angular/core';
-import {isPresent} from './facade/lang';
 
 /**
  * This class is a map from each component`s selector to that component's `ngContent` selectors.
@@ -45,7 +44,7 @@ export class RuntimeCompilerSpyFactory extends RuntimeCompilerFactory {
     runtimeCompiler._compileTemplate = function(template: any) {
       if (!template.isCompiled && !template.isHost) {
         const metadata = template.normalizedCompMeta;
-        if (isPresent(metadata.template) && isPresent(metadata.template.ngContentSelectors)) {
+        if (metadata.template && metadata.template.ngContentSelectors) {
           contentSelectors.set(metadata.selector, metadata.template.ngContentSelectors);
         }
       }

modules/@angular/upgrade/src/util.ts

@@ -6,7 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {CssSelector, SelectorMatcher, createElementCssSelector} from '@angular/compiler';
-import {isPresent} from './facade/lang';
 
 
 export function onError(e: any) {
@@ -22,7 +21,7 @@ export function controllerKey(name: string): string {
 function getAttributesAsArray(node: Node): string[][] {
   var attributes = node.attributes;
   var asArray: string[][];
-  if (isPresent(attributes)) {
+  if (attributes) {
     let attrLen = attributes.length;
     asArray = new Array(attrLen);
     for (var i = 0; i < attrLen; i++) {
@@ -51,7 +50,7 @@ export function sortProjectableNodes(ngContentSelectors: string[], childNodes: N
     matcher.match(
         selector, (selector, ngContentIndex) => { ngContentIndices.push(ngContentIndex); });
     ngContentIndices.sort();
-    if (isPresent(wildcardNgContentIndex)) {
+    if (wildcardNgContentIndex) {
       ngContentIndices.push(wildcardNgContentIndex);
     }
     if (ngContentIndices.length > 0) {