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

ios/chrome/browser/ui/fade_truncated_label.mm

 // Copyright 2014 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/fade_truncated_label.h"
 
 #include <algorithm>
-#include "base/mac/objc_property_releaser.h"
+
 #import "ios/chrome/browser/ui/animation_util.h"
 #import "ios/chrome/browser/ui/reversed_animation.h"
 #import "ui/gfx/ios/uikit_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // Animation key used for frame animations.
 NSString* const kFadeTruncatedLabelAnimationKey =
     @"FadeTruncatedLabelAnimationKey";
 }
 
 @interface FadeTruncatedLabel () {
-  base::mac::ObjCPropertyReleaser _propertyReleaser_FadeTruncatedLabel;
 }
 
 // Layer used to apply fade truncation to label.
-@property(nonatomic, retain) CAGradientLayer* maskLayer;
+@property(nonatomic, strong) CAGradientLayer* maskLayer;
 
 // Temporary label used during animations.
-@property(nonatomic, retain) UILabel* animationLabel;
+@property(nonatomic, strong) UILabel* animationLabel;
 
 // Returns the percentage of the label's width at which to begin the fade
 // gradient.
 + (CGFloat)gradientPercentageForText:(NSString*)text
                       withAttributes:(NSDictionary*)attributes
                             inBounds:(CGRect)bounds;
 
 @end
 
 @implementation FadeTruncatedLabel
 
 @synthesize maskLayer = _maskLayer;
 @synthesize animationLabel = _animationLabel;
 
 - (instancetype)initWithFrame:(CGRect)frame {
   self = [super initWithFrame:frame];
   if (self) {
-    // Initialize property releaser.
-    _propertyReleaser_FadeTruncatedLabel.Init(self, [FadeTruncatedLabel class]);
-
     // Set background color and line break mode.
     self.backgroundColor = [UIColor clearColor];
     self.lineBreakMode = NSLineBreakByClipping;
 
     // Instantiate |maskLayer| and add as mask.
     self.maskLayer = [[self class] maskLayerForText:self.text
                                      withAttributes:@{
                                        NSFontAttributeName : self.font
                                      }
                                            inBounds:{CGPointZero, frame.size}];
@@ skipping 36 matching lines @@
   frameAnimation.timingFunction = timingFunction;
   [self.layer addAnimation:frameAnimation
                     forKey:kFadeTruncatedLabelAnimationKey];
 
   // When animating, add a temporary label using the larger frame size so that
   // truncation can occur via the gradient rather than by the edge of the text
   // layer's backing store.
   CGSize animationTextSize =
       CGSizeMake(std::max(beginFrame.size.width, endFrame.size.width),
                  std::max(beginFrame.size.height, endFrame.size.height));
-  self.animationLabel = [[[UILabel alloc]
-      initWithFrame:{CGPointZero, animationTextSize}] autorelease];
+  self.animationLabel =
+      [[UILabel alloc] initWithFrame:{CGPointZero, animationTextSize}];
   self.animationLabel.text = self.text;
   self.animationLabel.textColor = self.textColor;
   self.animationLabel.font = self.font;
   [self addSubview:self.animationLabel];
 
   // Animate the mask layer.
   CGRect beginBounds = {CGPointZero, beginFrame.size};
   CGRect endBounds = {CGPointZero, endFrame.size};
   frameAnimation = FrameAnimationMake(self.maskLayer, beginBounds, endBounds);
   frameAnimation.duration = duration;
@@ skipping 65 matching lines @@
   maskLayer.startPoint = CGPointMake(0.0, 0.5);
   maskLayer.endPoint = CGPointMake(1.0, 0.5);
   CGFloat gradientBeginPercentage = [self gradientPercentageForText:text
                                                      withAttributes:attributes
                                                            inBounds:bounds];
   maskLayer.locations = @[ @(gradientBeginPercentage), @(1.0) ];
   return maskLayer;
 }
 
 @end