[ios] Remove IDC_BACK and IDC_FORWARD

ios/chrome/browser/ui/toolbar/toolbar_controller.mm

 // Copyright 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.
 
 #import "ios/chrome/browser/ui/toolbar/toolbar_controller.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/format_macros.h"
 #include "base/i18n/rtl.h"
@@ skipping 231 matching lines @@
 @end
 
 @implementation ToolbarController
 
 @synthesize readingListModel = readingListModel_;
 @synthesize view = view_;
 @synthesize backgroundView = backgroundView_;
 @synthesize shadowView = shadowView_;
 @synthesize toolsPopupController = toolsPopupController_;
 @synthesize style = style_;
+@synthesize dispatcher = dispatcher_;
 
 - (void)setReadingListModel:(ReadingListModel*)readingListModel {
   readingListModel_ = readingListModel;
   if (readingListModel_) {
     toolsMenuButtonObserverBridge_ =
         [[ToolsMenuButtonObserverBridge alloc] initWithModel:readingListModel_
                                                toolbarButton:toolsMenuButton_];
   }
 }
 
@@ skipping 289 matching lines @@
   if (button != toolsMenuButton_) {
     // |target| must be |self| (as opposed to |nil|) because |self| isn't in the
     // responder chain.
     [button addTarget:self
                   action:@selector(standardButtonPressed:)
         forControlEvents:UIControlEventTouchUpInside];
   }
   [button addTarget:self
                 action:@selector(recordUserMetrics:)
       forControlEvents:UIControlEventTouchUpInside];
-  [button addTarget:button
-                action:@selector(chromeExecuteCommand:)
-      forControlEvents:UIControlEventTouchUpInside];
+  // Only register buttons with defined tags for -chromeExecuteCommand:
+  if (button.tag) {
+    [button addTarget:button
+                  action:@selector(chromeExecuteCommand:)
+        forControlEvents:UIControlEventTouchUpInside];
+  }
 }
 
 - (CGRect)shareButtonAnchorRect {
   // Shrink the padding around the shareButton so the popovers are anchored
   // correctly.
   return CGRectInset([shareButton_ bounds], 10, 0);
 }
 
 - (UIView*)shareButtonView {
   return shareButton_;
@@ skipping 459 matching lines @@
 #pragma mark -
 #pragma mark PopupMenuDelegate methods.
 
 - (void)dismissPopupMenu:(PopupMenuController*)controller {
   if ([controller isKindOfClass:[ToolsPopupController class]] &&
       (ToolsPopupController*)controller == toolsPopupController_)
     [self dismissToolsMenuPopup];
 }
 
 @end