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

ios/chrome/browser/ui/omnibox/truncating_attributed_label.mm

 // Copyright (c) 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/omnibox/truncating_attributed_label.h"
 
 #include <algorithm>
 
-#include "base/mac/objc_property_releaser.h"
 #include "base/mac/scoped_cftyperef.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface OmniboxPopupTruncatingLabel ()
 - (void)setup;
 - (UIImage*)getLinearGradient:(CGRect)rect;
 @end
 
 @implementation OmniboxPopupTruncatingLabel {
   // Gradient used to create fade effect. Changes based on view.frame size.
-  base::scoped_nsobject<UIImage> gradient_;
-
-  base::mac::ObjCPropertyReleaser propertyReleaser_OmniboxPopupTruncatingLabel_;
+  UIImage* gradient_;
 }
 
 @synthesize truncateMode = truncateMode_;
 
 - (void)setup {
   self.backgroundColor = [UIColor clearColor];
   truncateMode_ = OmniboxPopupTruncatingTail;
 }
 
 - (id)initWithFrame:(CGRect)frame {
   self = [super initWithFrame:frame];
   if (self) {
-    propertyReleaser_OmniboxPopupTruncatingLabel_.Init(
-        self, [OmniboxPopupTruncatingLabel class]);
     self.lineBreakMode = NSLineBreakByClipping;
     [self setup];
   }
   return self;
 }
 
 - (void)awakeFromNib {
   [super awakeFromNib];
   [self setup];
 }
 
 - (void)setFrame:(CGRect)frame {
   [super setFrame:frame];
 
   // Cache the fade gradient when the frame changes.
   if (!CGRectIsEmpty(frame) &&
-      (!gradient_.get() || !CGSizeEqualToSize([gradient_ size], frame.size))) {
+      (!gradient_ || !CGSizeEqualToSize([gradient_ size], frame.size))) {
     CGRect rect = CGRectMake(0, 0, frame.size.width, frame.size.height);
-    gradient_.reset([[self getLinearGradient:rect] retain]);
+    gradient_ = [self getLinearGradient:rect];
   }
 }
 
 // Draw fade gradient mask if attributedText is wider than rect.
 - (void)drawTextInRect:(CGRect)requestedRect {
   CGContextRef context = UIGraphicsGetCurrentContext();
   CGContextSaveGState(context);
 
   if ([self.attributedText size].width > requestedRect.size.width)
     CGContextClipToMask(context, self.bounds, [gradient_ CGImage]);
 
   // Add the specified line break and alignment attributes to attributedText and
   // draw the result.
   NSMutableAttributedString* attributedString =
-      [[self.attributedText mutableCopy] autorelease];
+      [self.attributedText mutableCopy];
   NSMutableParagraphStyle* textStyle =
-      [[[NSParagraphStyle defaultParagraphStyle] mutableCopy] autorelease];
+      [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
   textStyle.lineBreakMode = self.lineBreakMode;
   textStyle.alignment = self.textAlignment;
   [attributedString addAttribute:NSParagraphStyleAttributeName
                            value:textStyle
                            range:NSMakeRange(0, [self.text length])];
   [attributedString drawInRect:requestedRect];
 
   CGContextRestoreGState(context);
 }
 
 - (void)setTextAlignment:(NSTextAlignment)textAlignment {
   if (textAlignment == NSTextAlignmentLeft) {
     self.truncateMode = OmniboxPopupTruncatingTail;
   } else if (textAlignment == NSTextAlignmentRight) {
     self.truncateMode = OmniboxPopupTruncatingHead;
   } else if (textAlignment == NSTextAlignmentNatural) {
     self.truncateMode = OmniboxPopupTruncatingTail;
   } else {
     NOTREACHED();
   }
 
   if (textAlignment != self.textAlignment)
-    gradient_.reset();
+    gradient_ = nil;
 
   [super setTextAlignment:textAlignment];
 }
 
 // Create gradient opacity mask based on direction.
 - (UIImage*)getLinearGradient:(CGRect)rect {
   // Create an opaque context.
   CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
   CGContextRef context =
       CGBitmapContextCreate(NULL, rect.size.width, rect.size.height, 8,
@@ skipping 31 matching lines @@
 
   // Clean up, return image.
   CGImageRef ref = CGBitmapContextCreateImage(context);
   UIImage* image = [UIImage imageWithCGImage:ref];
   CGImageRelease(ref);
   CGContextRelease(context);
   return image;
 }
 
 @end