[iOS] Add a space to refine query suggestions.

Bug: 862404
Change-Id: I3d775805657d7303cfbf6a04f581d855deb5717b
Reviewed-on: https://chromium-review.googlesource.com/1219507Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590296}

ios/chrome/browser/ui/omnibox/popup/omnibox_popup_view_ios.mm

@@ -123,6 +123,12 @@ void OmniboxPopupViewIOS::OnMatchSelectedForAppending(
   // Make a defensive copy of |match.fill_into_edit|, as CopyToOmnibox() will
   // trigger a new round of autocomplete and modify |match|.
   base::string16 fill_into_edit(match.fill_into_edit);
+
+  // If the match is not a URL, append a whitespace to the end of it.
+  if (AutocompleteMatch::IsSearchType(match.type)) {
+    fill_into_edit.append(1, ' ');
+  }
+
   delegate_->OnSelectedMatchForAppending(fill_into_edit);
 }