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

ios/chrome/browser/ui/side_swipe/side_swipe_navigation_view.mm

 // Copyright 2015 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/side_swipe_navigation_view.h"
 
 #include <cmath>
 
 #include "base/logging.h"
-#include "base/mac/objc_property_releaser.h"
-#include "base/mac/scoped_nsobject.h"
+
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #import "ios/chrome/browser/ui/side_swipe/side_swipe_util.h"
 #import "ios/chrome/browser/ui/side_swipe_gesture_recognizer.h"
 #include "ios/chrome/browser/ui/ui_util.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #import "ios/chrome/common/material_timing.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 enum class SwipeType { CHANGE_TABS, NAVIGATION };
 
 typedef struct {
   CGFloat min;
   CGFloat max;
 } FloatRange;
 
 CGFloat MapValueToRange(FloatRange from, FloatRange to, CGFloat value) {
@@ skipping 34 matching lines @@
 const CGFloat kSelectionAnimationDuration = 0.5;
 }
 
 @interface SideSwipeNavigationView () {
  @private
   // Has the current swipe gone past the point where the action would trigger?
   // Will be reset to NO if it recedes before that point (ie, not a latch).
   BOOL thresholdTriggered_;
 
   // The back or forward sprite image.
-  base::scoped_nsobject<UIImageView> arrowView_;
+  UIImageView* arrowView_;
 
   // The selection bubble.
   CAShapeLayer* selectionCircleLayer_;
 
   // If |NO| this is an edge gesture and navigation isn't possible. Don't show
   // arrows and bubbles and don't allow navigate.
   BOOL canNavigate_;
 
   // If |YES| arrowView_ is directionnal and must be rotated 180 degreed for the
   // forward panes.
   BOOL rotateForward_;
-
-  base::mac::ObjCPropertyReleaser _propertyReleaser_SideSwipeNavigationView;
 }
 // Returns a newly allocated and configured selection circle shape.
 - (CAShapeLayer*)newSelectionCircleLayer;
 // Pushes the touch towards the edge because it's difficult to touch the very
 // edge of the screen (touches tend to sit near x ~ 4).
 - (CGPoint)adjustPointToEdge:(CGPoint)point;
 @end
 
 @implementation SideSwipeNavigationView
 
 @synthesize targetView = targetView_;
 
 - (instancetype)initWithFrame:(CGRect)frame
                 withDirection:(UISwipeGestureRecognizerDirection)direction
                   canNavigate:(BOOL)canNavigate
                         image:(UIImage*)image
                 rotateForward:(BOOL)rotateForward {
   self = [super initWithFrame:frame];
   if (self) {
-    _propertyReleaser_SideSwipeNavigationView.Init(
-        self, [SideSwipeNavigationView class]);
     self.backgroundColor = [UIColor colorWithWhite:90.0 / 256 alpha:1.0];
 
     canNavigate_ = canNavigate;
     rotateForward_ = rotateForward;
     if (canNavigate) {
       image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
       const CGRect imageSize = CGRectMake(0, 0, 24, 24);
-      arrowView_.reset([[UIImageView alloc] initWithImage:image]);
+      arrowView_ = [[UIImageView alloc] initWithImage:image];
       [arrowView_ setTintColor:[UIColor whiteColor]];
       selectionCircleLayer_ = [self newSelectionCircleLayer];
       [arrowView_ setFrame:imageSize];
     }
 
     UIImage* shadowImage =
         [UIImage imageNamed:@"side_swipe_navigation_content_shadow"];
     CGRect borderFrame =
         CGRectMake(0, 0, shadowImage.size.width, self.frame.size.height);
-    base::scoped_nsobject<UIImageView> border(
-        [[UIImageView alloc] initWithFrame:borderFrame]);
+    UIImageView* border = [[UIImageView alloc] initWithFrame:borderFrame];
     [border setImage:shadowImage];
     [self addSubview:border];
     if (direction == UISwipeGestureRecognizerDirectionRight) {
       borderFrame.origin.x = frame.size.width - shadowImage.size.width;
       [border setFrame:borderFrame];
       [border setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
     } else {
       [border setTransform:CGAffineTransformMakeRotation(M_PI)];
       [border setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
     }
@@ skipping 290 matching lines @@
   selectionCircleLayer.opacity = 0;
   selectionCircleLayer.transform =
       CATransform3DMakeScale(kSelectionDownScale, kSelectionDownScale, 1);
   selectionCircleLayer.path =
       [[UIBezierPath bezierPathWithOvalInRect:bounds] CGPath];
 
   return selectionCircleLayer;
 }
 
 @end