mac: Move the bookmark bar overflow chevron from pdf to png

chrome/browser/ui/cocoa/bookmarks/bookmark_button_cell.mm

 // Copyright (c) 2011 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/ui/cocoa/bookmarks/bookmark_button_cell.h"
 
 #include "base/logging.h"
 #include "base/sys_string_conversions.h"
 #import "chrome/browser/bookmarks/bookmark_model.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_button.h"
@@ skipping 73 matching lines @@
   [self setBezelStyle:NSShadowlessSquareBezelStyle];
   [self setShowsBorderOnlyWhileMouseInside:YES];
   [self setControlSize:NSSmallControlSize];
   [self setAlignment:NSLeftTextAlignment];
   [self setFont:[NSFont systemFontOfSize:[NSFont smallSystemFontSize]]];
   [self setWraps:NO];
   // NSLineBreakByTruncatingMiddle seems more common on OSX but let's
   // try to match Windows for a bit to see what happens.
   [self setLineBreakMode:NSLineBreakByTruncatingTail];
 
+  // The overflow button chevron bitmap is not 16 units high, so it'd be scaled
+  // at paint time without this.
+  [self setImageScaling:NSImageScaleNone];
+
   // Theming doesn't work for bookmark buttons yet (cell text is chucked).
   [super setShouldTheme:NO];
 }
 
 - (BOOL)empty {
   return empty_;
 }
 
 - (void)setEmpty:(BOOL)empty {
   empty_ = empty;
@@ skipping 155 matching lines @@
               respectFlipped:YES
                        hints:nil];
   }
 }
 
 - (int)verticalTextOffset {
   return 0;
 }
 
 @end