[ios] Remove IDC_BACK and IDC_FORWARD

ios/chrome/browser/ui/browser_view_controller.mm

Index: ios/chrome/browser/ui/browser_view_controller.mm
diff --git a/ios/chrome/browser/ui/browser_view_controller.mm b/ios/chrome/browser/ui/browser_view_controller.mm
index f38b972e1e7d110dd6eec72cfccf99620852bfb6..a91e0aab568d2565d5bfbb8fccbcbf6958439746 100644
--- a/ios/chrome/browser/ui/browser_view_controller.mm
+++ b/ios/chrome/browser/ui/browser_view_controller.mm
@@ -1791,7 +1791,8 @@ class BrowserBookmarkModelBridge : public bookmarks::BookmarkModelObserver {
   _toolbarController = [_dependencyFactory
       newWebToolbarControllerWithDelegate:self
                                 urlLoader:self
-                          preloadProvider:_preloadController];
+                          preloadProvider:_preloadController
+                               dispatcher:self.browserCommandDispatcher];
   [_dispatcher startDispatchingToTarget:_toolbarController
                             forProtocol:@protocol(OmniboxFocuser)];
   [_toolbarController setTabCount:[_model count]];
@@ -4012,6 +4013,16 @@ class BrowserBookmarkModelBridge : public bookmarks::BookmarkModelObserver {
   return card;
 }
 
+#pragma mark - BrowserCommands
+
+- (void)goBack {
+  [[_model currentTab] goBack];
+}
+
+- (void)goForward {
+  [[_model currentTab] goForward];
+}
+
 #pragma mark - Command Handling
 
 - (IBAction)chromeExecuteCommand:(id)sender {
@@ -4022,9 +4033,6 @@ class BrowserBookmarkModelBridge : public bookmarks::BookmarkModelObserver {
   Tab* currentTab = [_model currentTab];
 
   switch (command) {
-    case IDC_BACK:
-      [[_model currentTab] goBack];
-      break;
     case IDC_BOOKMARK_PAGE:
       [self initializeBookmarkInteractionController];
       [_bookmarkInteractionController
@@ -4060,9 +4068,6 @@ class BrowserBookmarkModelBridge : public bookmarks::BookmarkModelObserver {
     case IDC_FIND_UPDATE:
       [self searchFindInPage];
       break;
-    case IDC_FORWARD:
-      [[_model currentTab] goForward];
-      break;
     case IDC_FULLSCREEN:
       NOTIMPLEMENTED();
       break;