Fix webstore extension reading in views.

Reading of views is now handled using ChromeVox Next with the automation API. The current Next background page fails on non-CROS because there's no commands block. We get an error like
getAll called on undefined.

(chrome.commands is undefined).

TEST=manually build ChromeVox; verify views reads properly.

Review URL: https://codereview.chromium.org/1138773006

Cr-Commit-Position: refs/heads/master@{#330249}

chrome/browser/resources/chromeos/chromevox/manifest.json.jinja2

@@ -55,8 +55,8 @@
   "automation": {
     "desktop": true
   },
-{% if is_chromevox_classic == '0' %}
   "commands": {
+{% if is_chromevox_classic == '0' %}
     "nextElement": {
       "description": "__MSG_CHROMEVOX_NEXT_OBJECT__",
       "suggested_key": {
@@ -279,8 +279,8 @@
         "chromeos": "Search+Shift+R"
       }
     }
-  },
 {% endif %}
+  },
   "options_page": "chromevox/background/options.html",
   "default_locale": "en"
 }