Remove code whitelisting chrome://app-list/ for speech recognition.

BUG=439143

Review URL: https://codereview.chromium.org/1023623002

Cr-Commit-Position: refs/heads/master@{#321481}

chrome/browser/speech/chrome_speech_recognition_manager_delegate.cc

@@ -416,17 +416,8 @@ void ChromeSpeechRecognitionManagerDelegate::CheckRenderViewType(
     return;
   }
 
-  WebContents* web_contents = WebContents::FromRenderViewHost(render_view_host);
-
-  // chrome://app-list/ uses speech recognition.
-  if (web_contents->GetCommittedWebUI() &&
-      web_contents->GetLastCommittedURL().spec() ==
-      chrome::kChromeUIAppListStartPageURL) {
-    allowed = true;
-    check_permission = false;
-  }
-
 #if defined(ENABLE_EXTENSIONS)
+  WebContents* web_contents = WebContents::FromRenderViewHost(render_view_host);
   extensions::ViewType view_type = extensions::GetViewType(web_contents);
 
   if (view_type == extensions::VIEW_TYPE_TAB_CONTENTS ||