Set "Cancel" button blue in iOS Share extension

ios/chrome/share_extension/share_extension_view.mm

 // Copyright 2016 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/share_extension/share_extension_view.h"
 
 #include "base/logging.h"
 #import "ios/chrome/share_extension/ui_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ skipping 291 matching lines @@
 
   // Create an empty image to replace the standard gray background of the
   // UINavigationBar.
   UIImage* emptyImage = [[UIImage alloc] init];
   [navigationBar setBackgroundImage:emptyImage
                       forBarMetrics:UIBarMetricsDefault];
   [navigationBar setShadowImage:emptyImage];
   [navigationBar setTranslucent:YES];
   [navigationBar setTranslatesAutoresizingMaskIntoConstraints:NO];
 
+  UIButton* systemButton = [UIButton buttonWithType:UIButtonTypeSystem];
+  UIColor* systemColor = [systemButton titleColorForState:UIControlStateNormal];
   UIBarButtonItem* cancelButton = [[UIBarButtonItem alloc]
       initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                            target:self
                            action:@selector(cancelPressed:)];
+  [cancelButton setTintColor:systemColor];
 
   NSString* appName =
       [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleDisplayName"];
   UINavigationItem* titleItem =
       [[UINavigationItem alloc] initWithTitle:appName];
   [titleItem setLeftBarButtonItem:cancelButton];
   [titleItem setHidesBackButton:YES];
   [navigationBar pushNavigationItem:titleItem animated:NO];
   return navigationBar;
 }
@@ skipping 101 matching lines @@
   [self.screenshotView.widthAnchor constraintEqualToConstant:kScreenshotSize]
       .active = YES;
   [self.titleURLContainer.trailingAnchor
       constraintEqualToAnchor:self.screenshotView.leadingAnchor
                      constant:-kShareExtensionPadding]
       .active = YES;
   [[self screenshotView] setImage:screenshot];
 }
 
 @end