[Mac] Fix a leak in HyperlinkButtonCell

chrome/browser/cocoa/hyperlink_button_cell.mm

 // Copyright (c) 2009 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 "chrome/browser/cocoa/hyperlink_button_cell.h"
 
 @interface HyperlinkButtonCell (Private)
 - (NSDictionary*)linkAttributres;
 - (void)customizeButtonCell;
 @end
@@ skipping 44 matching lines @@
   [self setHighlightsBy:NSNoCellMask];
 
   // We need to set this so that we can override |-mouseEntered:| and
   // |-mouseExited:| to change the cursor style on hover states.
   [self setShowsBorderOnlyWhileMouseInside:YES];
 }
 
 // Creates the NSDictionary of attributes for the attributed string.
 - (NSDictionary*)linkAttributes {
   NSUInteger underlineMask = NSUnderlinePatternSolid | NSUnderlineStyleSingle;
   NSMutableParagraphStyle* paragraphStyle =

[pink (ping after 24hrs), 2009/11/11 17:00:33]

the best (and more consistent) fix here would be to use a scoped_nsobject, but
good catch.

-    [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
+    [[[NSParagraphStyle defaultParagraphStyle] mutableCopy] autorelease];
   [paragraphStyle setAlignment:[self alignment]];
 
   return [NSDictionary dictionaryWithObjectsAndKeys:
       [self textColor], NSForegroundColorAttributeName,
       [NSNumber numberWithInt:underlineMask], NSUnderlineStyleAttributeName,
       [self font], NSFontAttributeName,
       [NSCursor pointingHandCursor], NSCursorAttributeName,
       paragraphStyle, NSParagraphStyleAttributeName,
       nil
   ];
@@ skipping 23 matching lines @@
 // Setters and getters.
 - (NSColor*)textColor {
   return textColor_.get();
 }
 
 - (void)setTextColor:(NSColor*)color {
   textColor_.reset([color retain]);
 }
 
 @end