[NTP][Realbox] Use AutocompleteMatch's |transition| for navigation

Autocomplete system provides the correct transition type to use when the
user navigates to a match. This is ui::PAGE_TRANSITION_TYPED for URL
matches and ui::PAGE_TRANSITION_GENERATED for other types which do not
look like a URL.

This allows for URL navigations from the NTP realbox to be correctly
recorded in the history backend and for the most visited tiles to be
updated accordingly.

Bug: 1090004
Change-Id: I1af862bfe8b926ccc729dc340fe8384e5759101b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224020Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774191}

chrome/browser/ui/search/search_tab_helper.cc

@@ -912,7 +912,7 @@ void SearchTabHelper::OpenAutocompleteMatch(
 
   web_contents_->OpenURL(
       content::OpenURLParams(match.destination_url, content::Referrer(),
-                             disposition, ui::PAGE_TRANSITION_LINK, false));
+                             disposition, match.transition, false));
   // May delete us.
 }
 

chrome/browser/ui/webui/new_tab_page/new_tab_page_handler.cc

@@ -879,7 +879,7 @@ void NewTabPageHandler::OpenAutocompleteMatch(
 
   web_contents_->OpenURL(
       content::OpenURLParams(match.destination_url, content::Referrer(),
-                             disposition, ui::PAGE_TRANSITION_LINK, false));
+                             disposition, match.transition, false));
 }
 
 void NewTabPageHandler::DeleteAutocompleteMatch(uint8_t line) {