Fix tab presentation metrics

ios/chrome/browser/ui/stack_view/stack_view_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/stack_view/stack_view_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 2066 matching lines @@
       CGPointMake(CGRectGetMidX(viewBounds), CGRectGetMidY(viewBounds));
   [self.view addSubview:newCard];
 
   void (^completionBlock)(void) = ^{
     [newCard removeFromSuperview];
     [[_scrollView layer] setShouldRasterize:NO];
     [_delegate tabSwitcherDismissTransitionDidEnd:self];
     double duration = [NSDate timeIntervalSinceReferenceDate] - startTime;
     if (_activeCardSet.tabModel.isOffTheRecord) {
       UMA_HISTOGRAM_TIMES(
-          "Toolbar.TabSwitcher.NewIncognitoTabPresentationDurationn",
+          "Toolbar.TabSwitcher.NewIncognitoTabPresentationDuration",
           base::TimeDelta::FromSecondsD(duration));
     } else {
       UMA_HISTOGRAM_TIMES("Toolbar.TabSwitcher.NewTabPresentationDuration",
                           base::TimeDelta::FromSecondsD(duration));
     }
   };
 
   CGPoint origin = _lastTapPoint;
   _lastTapPoint = CGPointZero;
   ios_internal::page_animation_util::AnimateInPaperWithAnimationAndCompletion(
@@ skipping 1418 matching lines @@
 
 @end
 
 @implementation StackViewController (Testing)
 
 - (UIScrollView*)scrollView {
   return _scrollView.get();
 }
 
 @end