LabelObserver is no longer retained by the label

ios/chrome/browser/ui/util/CRUILabel+AttributeUtils.h

Index: ios/chrome/browser/ui/util/CRUILabel+AttributeUtils.h
diff --git a/ios/chrome/browser/ui/util/CRUILabel+AttributeUtils.h b/ios/chrome/browser/ui/util/CRUILabel+AttributeUtils.h
index 9cacedef7fe5ca6673b8a9c220797b1c1fde41bc..97f4b9b523fff44f60e48f27eea7660279ac25fe 100644
--- a/ios/chrome/browser/ui/util/CRUILabel+AttributeUtils.h
+++ b/ios/chrome/browser/ui/util/CRUILabel+AttributeUtils.h
@@ -8,11 +8,11 @@
 #import <UIKit/UIKit.h>
 
 @interface UILabel (CRUILabelAttributeUtils)
+// The height of the label.
+// Make sure to create a LabelObserver for this label and start observing before
+// setting this property.
 @property(nonatomic, assign, setter=cr_setLineHeight:) CGFloat cr_lineHeight;
 
-// Adjusts the line height of the receiver so that the lines will evenly f
-- (void)cr_adjustLineHeightForMaximimumLines:(NSUInteger)maximumLines;
-
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_UTIL_CRUILABEL_ATTRIBUTEUTILS_H_