Remove ordering restriction for VoiceSearchTabHelper creation

Tab no longer use the VoiceSearchTabHelper, so ordering is not needed
any more

Bug: 778416
Change-Id: I37a84f76de97be5af8956eb829808f86ac839468
Reviewed-on: https://chromium-review.googlesource.com/c/1353937Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611943}

ios/chrome/browser/tabs/tab_helper_util.mm

@@ -57,12 +57,6 @@
 #import "ios/web/public/web_state/web_state.h"
 
 void AttachTabHelpers(web::WebState* web_state, bool for_prerender) {
-  // Tab's WebStateObserver callbacks expect VoiceSearchNavigationTabHelper's
-  // callbacks to be executed first so that state stays in sync.
-  // TODO(crbug.com/778416): Remove this ordering requirement by relying solely
-  // on the tab helper without going through Tab.
-  VoiceSearchNavigationTabHelper::CreateForWebState(web_state);
-
   // TabIdHelper sets up the tab ID which is required for the creation of the
   // Tab by LegacyTabHelper.
   TabIdTabHelper::CreateForWebState(web_state);
@@ -79,6 +73,7 @@ void AttachTabHelpers(web::WebState* web_state, bool for_prerender) {
 
   NSString* tab_id = TabIdTabHelper::FromWebState(web_state)->tab_id();
   NetworkActivityIndicatorTabHelper::CreateForWebState(web_state, tab_id);
+  VoiceSearchNavigationTabHelper::CreateForWebState(web_state);
   IOSChromeSyncedTabDelegate::CreateForWebState(web_state);
   InfoBarManagerImpl::CreateForWebState(web_state);
   IOSSecurityStateTabHelper::CreateForWebState(web_state);