[Extensions] Update shortcuts provider test to use manifest v2

Update shortcuts_provider_extension_unittest.cc to generate extensions
using manifest_version 2.

Bug: 816679
Change-Id: I1d895e66c6ebadff948ff78690d1130fbc725f4f
Reviewed-on: https://chromium-review.googlesource.com/1008603
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549985}

chrome/browser/autocomplete/shortcuts_provider_extension_unittest.cc

@@ -98,11 +98,7 @@ TEST_F(ShortcutsProviderExtensionTest, Extension) {
 
   // Claim the extension has been unloaded.
   scoped_refptr<const extensions::Extension> extension =
-      extensions::ExtensionBuilder()
-          .SetManifest(extensions::DictionaryBuilder()
-                           .Set("name", "Echo")
-                           .Set("version", "1.0")
-                           .Build())
+      extensions::ExtensionBuilder("Echo")
           .SetID("cedabbhfglmiikkmdgcpjdkocfcmbkee")
           .Build();
   extensions::ExtensionRegistry::Get(&profile_)->TriggerOnUnloaded(