Remove implicit group creation on ctrl+click

We've gotten enough feedback on this that PM and UX have suggested that we remove this behavior.

This change removes the groups that are magically created when the user opens a new tab via a link. Tabs opened from an already-grouped tab will still be opened within that group.


Bug: 997344
Change-Id: Iad1ede15edc06356db9728bbcf5e4f59a4eae207
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898620Reviewed-by: Charlene Yan <cyan@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Connie Wan <connily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712634}

chrome/browser/ui/browser_tabstrip.cc

@@ -112,10 +112,6 @@ void ConfigureTabGroupForNavigation(NavigateParams* nav_params) {
   if (nav_params->disposition == WindowOpenDisposition::NEW_FOREGROUND_TAB ||
       nav_params->disposition == WindowOpenDisposition::NEW_BACKGROUND_TAB) {
     nav_params->group = model->GetTabGroupForTab(source_index);
-    // TODO(crbug.com / 997344): Re-evaluate implicit link creation, and either
-    // remove this or add tests.
-    if (!nav_params->group)
-      nav_params->group = model->AddToNewGroup({source_index});
   }
 }