Use standardized accelerator-to-shortcut code for new backspace shortcut UI.

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 287 matching lines @@
   }
 
   // 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);
       else
-        browser_->window()->MaybeShowNewBackShortcutBubble(false);
+        browser_->window()->MaybeShowNewBackShortcutBubble(IDC_BACK);
       break;
     case IDC_BACK:
       browser_->window()->HideNewBackShortcutBubble();
       GoBack(browser_, disposition);
       break;
     case IDC_BACKSPACE_FORWARD:
       if (base::FeatureList::IsEnabled(features::kBackspaceGoesBackFeature))
         GoForward(browser_, disposition);
       else
-        browser_->window()->MaybeShowNewBackShortcutBubble(true);
+        browser_->window()->MaybeShowNewBackShortcutBubble(IDC_FORWARD);
       break;
     case IDC_FORWARD:
       browser_->window()->HideNewBackShortcutBubble();
       GoForward(browser_, disposition);
       break;
     case IDC_RELOAD:
       Reload(browser_, disposition);
       break;
     case IDC_RELOAD_CLEARING_CACHE:
       ClearCache(browser_);
@@ skipping 845 matching lines @@
 
 BrowserWindow* BrowserCommandController::window() {
   return browser_->window();
 }
 
 Profile* BrowserCommandController::profile() {
   return browser_->profile();
 }
 
 }  // namespace chrome