Added notification when user presses backspace to use new shortcut.

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 305 matching lines @@
     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(kBackspaceGoesBackFeature))
         GoBack(browser_, disposition);
+      else
+        browser_->window()->ShowBackspaceNewShortcutBubble(false);
       break;
     case IDC_BACKSPACE_FORWARD:
       if (base::FeatureList::IsEnabled(kBackspaceGoesBackFeature))
         GoForward(browser_, disposition);
+      else
+        browser_->window()->ShowBackspaceNewShortcutBubble(true);
       break;
     case IDC_BACK:
       GoBack(browser_, disposition);
       break;
     case IDC_FORWARD:
       GoForward(browser_, disposition);
       break;
     case IDC_RELOAD:
       Reload(browser_, disposition);
       break;
@@ skipping 928 matching lines @@
 
 BrowserWindow* BrowserCommandController::window() {
   return browser_->window();
 }
 
 Profile* BrowserCommandController::profile() {
   return browser_->profile();
 }
 
 }  // namespace chrome