Enable tab switcher longpress menu in default

This CL defaults enabling tab switcher longpress menu feature.

Bug: 1012914
Change-Id: I39cb104bdfb8017fa4e57abce87fbdb18b2a32e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850798Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Lijin Shen <lazzzis@google.com>
Cr-Commit-Position: refs/heads/master@{#704434}

chrome/browser/android/chrome_feature_list.cc

@@ -547,8 +547,8 @@ const base::Feature kTabGridLayoutAndroid{"TabGridLayoutAndroid",
 const base::Feature kTabReparenting{"TabReparenting",
                                     base::FEATURE_ENABLED_BY_DEFAULT};
 
-const base::Feature kTabSwitcherLongpressMenu{
-    "TabSwitcherLongpressMenu", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kTabSwitcherLongpressMenu{"TabSwitcherLongpressMenu",
+                                              base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kTabSwitcherOnReturn{"TabSwitcherOnReturn",
                                          base::FEATURE_DISABLED_BY_DEFAULT};