Revert of [ObjC ARC] Converts ios/chrome/browser/ui/toolbar:toolbar to ARC.

ios/chrome/browser/ui/toolbar/toolbar_tools_menu_button.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/browser/ui/toolbar/toolbar_tools_menu_button.h"
 
 #import <QuartzCore/CAAnimation.h>
 #import <QuartzCore/CAMediaTimingFunction.h>
 
 #include "ios/chrome/browser/ui/toolbar/toolbar_button_tints.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 namespace {
 // The number of dots drawn.
 const int kNumberOfDots = 3;
 // Position of the topmost dot.
 const CGFloat kDotOffsetX = 22;
 const CGFloat kDotOffsetY = 18;
 // Vertical space between dots.
 const CGFloat kVerticalSpaceBetweenDots = 6;
 // The duration of the animation, in seconds.
 const CFTimeInterval kAnimationDuration = 1;
@@ skipping 19 matching lines @@
 }  // namespace
 
 @interface ToolbarToolsMenuButton ()<CAAnimationDelegate> {
   // The style of the toolbar the button is in.
   ToolbarControllerStyle style_;
   // Whether the tools menu is visible.
   BOOL toolsMenuVisible_;
   // Whether the reading list contains unseen items.
   BOOL readingListContainsUnseenItems_;
   // The CALayers containing the drawn dots.
-  NSMutableArray<CAShapeLayer*>* pathLayers_;
+  base::scoped_nsobject<CAShapeLayer> pathLayers_[kNumberOfDots];
   // Whether the CALayers are being animated.
   BOOL animationOnGoing_;
 }
 // Updates the tint configuration based on the button's situation, e.g. whether
 // the tools menu is visible or not.
 - (void)updateTintOfButton;
 // Initializes the pathLayers.
 - (void)initializeShapeLayers;
 // Returns a keyframe-based animation of the property identified by |keyPath|.
 // The animation immidiately sets the property's value to |initialValue|.
@@ skipping 12 matching lines @@
 
 - (instancetype)initWithFrame:(CGRect)frame
                         style:(ToolbarControllerStyle)style {
   if (self = [super initWithFrame:frame]) {
     style_ = style;
 
     [self setTintColor:toolbar::NormalButtonTint(style_)
               forState:UIControlStateNormal];
     [self setTintColor:toolbar::HighlighButtonTint(style_)
               forState:UIControlStateHighlighted];
-    pathLayers_ = [[NSMutableArray alloc] initWithCapacity:kNumberOfDots];
   }
   return self;
 }
 
 - (void)setToolsMenuIsVisible:(BOOL)toolsMenuVisible {
   toolsMenuVisible_ = toolsMenuVisible;
   [self updateTintOfButton];
 }
 
 - (void)setReadingListContainsUnseenItems:(BOOL)readingListContainsUnseenItems {
@@ skipping 12 matching lines @@
     [self setTintColor:toolbar::HighlighButtonTint(style_)
               forState:UIControlStateNormal];
   } else {
     [self setTintColor:toolbar::NormalButtonTint(style_)
               forState:UIControlStateNormal];
   }
 }
 
 - (void)initializeShapeLayers {
   for (int i = 0; i < kNumberOfDots; i++) {
-    CAShapeLayer* pathLayer = pathLayers_[i];
+    base::scoped_nsobject<CAShapeLayer>& pathLayer = pathLayers_[i];
     if (pathLayer) {
       [pathLayer removeFromSuperlayer];
     }
 
     const CGFloat x = kDotOffsetX;
     const CGFloat y = kDotOffsetY + kVerticalSpaceBetweenDots * i;
 
     UIBezierPath* path = [UIBezierPath bezierPath];
     [path moveToPoint:CGPointMake(x - kMaxWidthOfSegment * 0.5, y)];
     [path addLineToPoint:CGPointMake(x + kMaxWidthOfSegment * 0.5, y)];
 
-    pathLayer = [CAShapeLayer layer];
+    pathLayer.reset([[CAShapeLayer layer] retain]);
     [pathLayer setFrame:self.bounds];
     [pathLayer setPath:path.CGPath];
     [pathLayer setStrokeColor:[self.tintColor CGColor]];
     [pathLayer setFillColor:nil];
     [pathLayer setLineWidth:kLineWidthAtRest];
     [pathLayer setLineCap:kCALineCapRound];
     [pathLayer setStrokeStart:kStrokeStartAtRest];
     [pathLayer setStrokeEnd:kStrokeEndAtRest];
-    [self.layer addSublayer:pathLayer];
-    pathLayers_[i] = pathLayer;
+    [self.layer addSublayer:pathLayer.get()];
   }
 }
 
 - (CAAnimation*)animationWithInitialValue:(id)initialValue
                         intermediaryValue:(id)intermediaryValue
                                finalValue:(id)finalValue
                                frameStart:(int)frameStart
                                forKeyPath:(NSString*)keyPath {
   // The property is animated the following way:
   //
@@ skipping 51 matching lines @@
 #endif
 
   return animation;
 }
 
 - (void)animateToColor:(UIColor*)targetColor {
   animationOnGoing_ = YES;
 
   // Add four animations for each stroke.
   for (int i = 0; i < kNumberOfDots; i++) {
-    CAShapeLayer* pathLayer = pathLayers_[i];
+    base::scoped_nsobject<CAShapeLayer>& pathLayer = pathLayers_[i];
+    DCHECK(pathLayer.get());
     const int frameStart =
         (kNumberOfDots - i) * kFramesBetweenAnimationOfEachDot;
 
     // Start of the stroke animation.
     CAAnimation* strokeStartAnimation =
         [self animationWithInitialValue:@(kStrokeStartAtRest)
                       intermediaryValue:@(kStrokeStartAtApogee)
                              finalValue:@(kStrokeStartAtRest)
                              frameStart:frameStart
                              forKeyPath:@"strokeStart"];
@@ skipping 59 matching lines @@
 #pragma mark - CAAnimationDelegate
 
 - (void)animationDidStop:(CAAnimation*)animation finished:(BOOL)flag {
   animationOnGoing_ = NO;
   // Recreate the CAShapeLayers in case the tint code changed while the
   // animation was going on.
   [self initializeShapeLayers];
 }
 
 @end