LabelObserver is no longer retained by the label

ios/chrome/browser/ui/util/CRUILabel+AttributeUtils.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.
 
 #include "ios/chrome/browser/ui/util/CRUILabel+AttributeUtils.h"
 
 #import <objc/runtime.h>
 
 #import "base/ios/weak_nsobject.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 56 matching lines @@
     style = [NSParagraphStyle defaultParagraphStyle];
   base::scoped_nsobject<NSMutableParagraphStyle> newStyle([style mutableCopy]);
   [newStyle setMinimumLineHeight:lineHeight];
   [newStyle setMaximumLineHeight:lineHeight];
   [newString addAttribute:NSParagraphStyleAttributeName
                     value:newStyle
                     range:NSMakeRange(0, [newString length])];
   self.attributedText = newString;
 }
 
-- (void)cr_adjustLineHeightForMaximimumLines:(NSUInteger)maximumLines {
-  CGSize labelSize = self.bounds.size;
-  CGFloat lineHeight = self.cr_lineHeight;
-  CGFloat numberOfLines = floorf(labelSize.height / lineHeight);
-  CGSize maxSize = CGSizeMake(labelSize.width, CGFLOAT_MAX);
-  CGSize textSize = [self sizeThatFits:maxSize];
-
-  // |textSize.height| should be a multiple of |lineHeight|. If this is not the
-  // case, then it is safer to fit one more line to ensure that the text of the
-  // label is not cropped.
-  CGFloat requiredNumberOfLines = ceilf(textSize.height / lineHeight);
-  if (requiredNumberOfLines > numberOfLines) {
-    requiredNumberOfLines = MIN(requiredNumberOfLines, maximumLines);
-    self.cr_lineHeight = floorf(labelSize.height / requiredNumberOfLines);
-  }
-}
-
 @end