Use current default parser for full-content tests

Also update the full-content fixtures with the resulting changes.

blocks/test/fixtures/core-button-center.html

@@ -1,3 +1,3 @@
 <!-- wp:core/button align="center" -->
-<div class="aligncenter"><a href="https://github.com/WordPress/gutenberg"><span>Help build Gutenberg</span></a></div>
+<div class="aligncenter"><a href="https://github.com/WordPress/gutenberg">Help build Gutenberg</a></div>
 <!-- /wp:core/button -->

blocks/test/fixtures/core-freeform.json

@@ -4,13 +4,13 @@
         "name": "core/freeform",
         "attributes": {
             "content": [
-                "Testing freeform block with some",
+                "Testing freeform block with some\n",
                 {
                     "attributes": {
                         "className": "wp-some-class"
                     },
                     "children": [
-                        "HTML ",
+                        "\n\tHTML ",
                         {
                             "attributes": {
                                 "style": {
@@ -19,7 +19,8 @@
                             },
                             "children": "content",
                             "type": "span"
-                        }
+                        },
+                        "\n"
                     ],
                     "type": "div"
                 }

blocks/test/fixtures/core-freeform.serialized.html

@@ -1,5 +1,7 @@
 <!-- wp:core/freeform -->
 Testing freeform block with some
-<div class="wp-some-class">HTML <span style="color:red;">content</span></div>
+<div class="wp-some-class">
+    HTML <span style="color:red;">content</span>
+</div>
 <!-- /wp:core/freeform -->
 

blocks/test/fixtures/core-text-multi-paragraph.json

@@ -15,6 +15,7 @@
                         "—somewhat similar to LEGO bricks—that you can move around and interact with. Move your cursor around and you'll notice the different blocks light up with outlines and arrows. Press the arrows to reposition blocks quickly, without fearing about losing things in the process of copying and pasting."
                     ]
                 },
+                "\n",
                 {
                     "type": "p",
                     "children": [

blocks/test/full-content.js

@@ -10,10 +10,7 @@ import { format } from 'util';
 /**
  * Internal dependencies
  */
-import {
-	// parseWithGrammar,
-	parseWithTinyMCE,
-} from '../api/parser';
+import parse from '../api/parser';
 import serialize from '../api/serializer';
 import { getBlockTypes } from '../api/registration';
 
@@ -94,7 +91,7 @@ describe( 'full post content fixture', () => {
 		it( f, () => {
 			const content = readFixtureFile( f + '.html' );
 
-			const blocksActual = parseWithTinyMCE( content );
+			const blocksActual = parse( content );
 			const blocksActualNormalized = normalizeParsedBlocks( blocksActual );
 			let blocksExpectedString = readFixtureFile( f + '.json' );