Remove the BackspaceGoesBack flag.

chrome/browser/ui/browser_command_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/browser_command_controller.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 290 matching lines @@
     last_blocked_command_id_ = id;
     last_blocked_command_disposition_ = disposition;
     return;
   }
 
   // The order of commands in this switch statement must match the function
   // declaration order in browser.h!
   switch (id) {
     // Navigation commands
     case IDC_BACKSPACE_BACK:
-      if (base::FeatureList::IsEnabled(features::kBackspaceGoesBackFeature))
-        GoBack(browser_, disposition);

[michaelpg, 2017/05/10 23:41:51]

can remove chrome_features.h #include here, too

[ojan, 2017/05/11 00:53:28]

done

-      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();
       GoForward(browser_, disposition);
       break;
     case IDC_RELOAD:
       Reload(browser_, disposition);
       break;
     case IDC_RELOAD_CLEARING_CACHE:
       ClearCache(browser_);
@@ skipping 815 matching lines @@
 
 BrowserWindow* BrowserCommandController::window() {
   return browser_->window();
 }
 
 Profile* BrowserCommandController::profile() {
   return browser_->profile();
 }
 
 }  // namespace chrome