Revert "refactor(material/dialog): use embedded injector to provide ref to template dialogs"

This reverts commit 6d0487b.

Author: crisbeto

src/material/dialog/dialog-content-directives.ts

@@ -149,10 +149,6 @@ export class MatDialogContent {}
 })
 export class MatDialogActions {}
 
-// TODO(crisbeto): this utility shouldn't be necessary anymore, because the dialog ref is provided
-// both to component and template dialogs through DI. We need to keep it around, because there are
-// some internal wrappers around `MatDialog` that happened to work by accident, because we had this
-// fallback logic in place.
 /**
  * Finds the closest MatDialogRef to an element by looking at the DOM.
  * @param element Element relative to which to look for a dialog.

src/material/dialog/dialog.ts

@@ -292,21 +292,16 @@ export abstract class _MatDialogBase<C extends _MatDialogContainerBase> implemen
     // Create a reference to the dialog we're creating in order to give the user a handle
     // to modify and close it.
     const dialogRef = new this._dialogRefConstructor(overlayRef, dialogContainer, config.id);
-    const injector = this._createInjector<T>(config, dialogRef, dialogContainer);
 
     if (componentOrTemplateRef instanceof TemplateRef) {
       dialogContainer.attachTemplatePortal(
-        new TemplatePortal<T>(
-          componentOrTemplateRef,
-          null!,
-          <any>{
-            $implicit: config.data,
-            dialogRef,
-          },
-          injector,
-        ),
+        new TemplatePortal<T>(componentOrTemplateRef, null!, <any>{
+          $implicit: config.data,
+          dialogRef,
+        }),
       );
     } else {
+      const injector = this._createInjector<T>(config, dialogRef, dialogContainer);
       const contentRef = dialogContainer.attachComponentPortal<T>(
         new ComponentPortal(
           componentOrTemplateRef,