[ObjC ARC] Converts ios/chrome/browser/ui/side_swipe:side_swipe to ARC.

ios/chrome/browser/ui/side_swipe/card_side_swipe_view.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/side_swipe/card_side_swipe_view.h"
 
 #include <cmath>
 
 #include "base/ios/device_util.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #import "ios/chrome/browser/tabs/tab.h"
 #import "ios/chrome/browser/tabs/tab_model.h"
 #import "ios/chrome/browser/ui/background_generator.h"
 #import "ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.h"
 #include "ios/chrome/browser/ui/rtl_geometry.h"
 #import "ios/chrome/browser/ui/side_swipe/side_swipe_util.h"
 #import "ios/chrome/browser/ui/side_swipe_gesture_recognizer.h"
 #import "ios/chrome/browser/ui/toolbar/web_toolbar_controller.h"
 #include "ios/chrome/browser/ui/ui_util.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #include "ios/chrome/grit/ios_theme_resources.h"
 #import "ios/web/web_state/ui/crw_web_controller.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using base::UserMetricsAction;
 
 namespace {
 // Spacing between cards.
 const CGFloat kCardHorizontalSpacing = 30;
 
 // Portion of the screen an edge card can be dragged.
 const CGFloat kEdgeCardDragPercentage = 0.35;
 
 // Card animation times.
@@ skipping 99 matching lines @@
 
 - (id)initWithFrame:(CGRect)frame
           topMargin:(CGFloat)topMargin
               model:(TabModel*)model {
   self = [super initWithFrame:frame];
   if (self) {
     model_ = model;
     currentPoint_ = CGPointZero;
     topMargin_ = topMargin;
 
-    base::scoped_nsobject<UIView> background(
-        [[UIView alloc] initWithFrame:CGRectZero]);
+    UIView* background = [[UIView alloc] initWithFrame:CGRectZero];
     [self addSubview:background];
 
     [background setTranslatesAutoresizingMaskIntoConstraints:NO];
     [NSLayoutConstraint activateConstraints:@[
       [[background rightAnchor] constraintEqualToAnchor:self.rightAnchor],
       [[background leftAnchor] constraintEqualToAnchor:self.leftAnchor],
       [[background topAnchor] constraintEqualToAnchor:self.topAnchor
                                              constant:-StatusBarHeight()],
       [[background bottomAnchor] constraintEqualToAnchor:self.bottomAnchor]
     ]];
@@ skipping 230 matching lines @@
       completion:^(BOOL finished) {
         [leftCard_ setImage:nil];
         [rightCard_ setImage:nil];
         [leftCard_ setToolbarImage:nil isNewTabPage:NO];
         [rightCard_ setToolbarImage:nil isNewTabPage:NO];
         [delegate_ sideSwipeViewDismissAnimationDidEnd:self];
       }];
 }
 
 @end