Shrink to fit the label on ReadingListToolbar

ios/chrome/browser/ui/reading_list/reading_list_toolbar.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/reading_list/reading_list_toolbar.h"
 
 #include "base/logging.h"
 #import "ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #include "ios/chrome/browser/ui/rtl_geometry.h"
@@ skipping 219 matching lines @@
   [self setMarkButtonText:l10n_util::GetNSStringWithFixup(
                               IDS_IOS_READING_LIST_MARK_BUTTON)];
 }
 
 - (UIButton*)buttonWithText:(NSString*)title
                 destructive:(BOOL)isDestructive
                 positioning:(ButtonPositioning)position {
   UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];
   button.contentEdgeInsets = UIEdgeInsetsMake(0, 8, 0, 8);
   [button setTitle:title forState:UIControlStateNormal];
-  button.titleLabel.numberOfLines = 0;
+  button.titleLabel.numberOfLines = 3;
+  button.titleLabel.adjustsFontSizeToFitWidth = YES;
 
   button.backgroundColor = [UIColor whiteColor];
   UIColor* textColor = isDestructive ? [[MDCPalette cr_redPalette] tint500]
                                      : [[MDCPalette cr_bluePalette] tint500];
   [button setTitleColor:textColor forState:UIControlStateNormal];
   [button setTitleColor:[UIColor lightGrayColor]
                forState:UIControlStateDisabled];
   [button setTitleColor:[textColor colorWithAlphaComponent:0.3]
                forState:UIControlStateHighlighted];
   [[button titleLabel]
@@ skipping 46 matching lines @@
                      16) {
         [self.heightDelegate toolbar:self onHeightChanged:ExpandedHeight];
         return;
       }
     }
   }
   [self.heightDelegate toolbar:self onHeightChanged:NormalHeight];
 }
 
 @end