Remove the BackspaceGoesBack flag.

chrome/browser/ui/browser_command_controller.cc

Index: chrome/browser/ui/browser_command_controller.cc
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index e917e1714c823428dc008522b8c9da25e9a191f0..4ea15d23bb68ae8b27e16db7301a03b916689b1b 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -308,20 +308,14 @@ void BrowserCommandController::ExecuteCommandWithDisposition(
   switch (id) {
     // Navigation commands
     case IDC_BACKSPACE_BACK:
-      if (base::FeatureList::IsEnabled(features::kBackspaceGoesBackFeature))
-        GoBack(browser_, disposition);
-      else
-        window()->MaybeShowNewBackShortcutBubble(false);
+      window()->MaybeShowNewBackShortcutBubble(false);
       break;
     case IDC_BACK:
       window()->HideNewBackShortcutBubble();
       GoBack(browser_, disposition);
       break;
     case IDC_BACKSPACE_FORWARD:
-      if (base::FeatureList::IsEnabled(features::kBackspaceGoesBackFeature))
-        GoForward(browser_, disposition);
-      else
-        window()->MaybeShowNewBackShortcutBubble(true);
+      window()->MaybeShowNewBackShortcutBubble(true);
       break;
     case IDC_FORWARD:
       window()->HideNewBackShortcutBubble();