refactor(core/testing): remove deprecated ViewMetadata (#10837)

Note that this doesn't actually remove all uses, but makes them
private.

modules/benchmarks/src/compiler/compiler_benchmark.ts

@@ -10,9 +10,10 @@ import {
   Component,
   Directive,
   ViewContainerRef,
-  ViewMetadata
 } from '@angular/core';
 
+import {ViewMetadata} from '@angular/core/src/metadata/view';
+
 import {CompilerConfig, DirectiveResolver} from '@angular/compiler';
 
 import {getIntParameter, bindAction} from '@angular/testing/src/benchmark_util';