[ios] Fixes the recent tabs button on the NTP.

ios/chrome/browser/ui/ntp/new_tab_page_bar.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/ntp/new_tab_page_bar.h"
 
 #import <QuartzCore/QuartzCore.h>
 #include <cmath>
 
 #include "base/logging.h"
@@ skipping 125 matching lines @@
 - (void)layoutSubviews {
   [super layoutSubviews];
 
   // |buttonWidth_| changes with the screen orientation when the NTP button bar
   // is enabled.
   [self calculateButtonWidth];
 
   CGFloat logoWidth = logoView_.get().image.size.width;
   CGFloat padding = [self useIconsInButtons] ? logoWidth : 0;
   CGFloat buttonPadding = floor((CGRectGetWidth(self.bounds) - padding -
-                                 (buttonWidth_ * self.buttons.count) / 2) +
+                                 buttonWidth_ * self.buttons.count) /
+                                    2 +
                                 padding);
 
   for (NSUInteger i = 0; i < self.buttons.count; ++i) {
     NewTabPageBarButton* button = [self.buttons objectAtIndex:i];
     LayoutRect layout = LayoutRectMake(
         buttonPadding + (i * buttonWidth_), CGRectGetWidth(self.bounds), 0,
         buttonWidth_, CGRectGetHeight(self.bounds));
     button.frame = LayoutRectGetRect(layout);
     [button
         setContentToDisplay:[self useIconsInButtons]
@@ skipping 164 matching lines @@
   return !IsIPadIdiom() || IsCompactTablet();
 }
 
 - (BOOL)showOverlay {
   // The bar buttons launch modal dialogs on tap on iPhone. Don't show overlay
   // in this case.
   return IsIPadIdiom();
 }
 
 @end