Don't draw a window title on browser windows.

chrome/browser/ui/cocoa/framed_browser_window.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_FRAMED_BROWSER_WINDOW_H_
 #define CHROME_BROWSER_UI_COCOA_FRAMED_BROWSER_WINDOW_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "chrome/browser/ui/cocoa/chrome_browser_window.h"
 
 // Offsets from the top/left of the window frame to the top of the window
 // controls (zoom, close, miniaturize) for a window with a tabstrip.
 const NSInteger kFramedWindowButtonsWithTabStripOffsetFromTop = 11;
 const NSInteger kFramedWindowButtonsWithTabStripOffsetFromLeft = 11;
 
 // Offsets from the top/left of the window frame to the top of the window
 // controls (zoom, close, miniaturize) for a window without a tabstrip.
 const NSInteger kFramedWindowButtonsWithoutTabStripOffsetFromTop = 4;
 const NSInteger kFramedWindowButtonsWithoutTabStripOffsetFromLeft = 8;
 
 // Cocoa class representing a framed browser window.
 // We need to override NSWindow with our own class since we need access to all
 // unhandled keyboard events and subclassing NSWindow is the only method to do
 // this. We also handle our own window controls and custom window frame drawing.
 @interface FramedBrowserWindow : ChromeBrowserWindow {
  @private
+  // Only used from 10.6-10.9.
   BOOL shouldHideTitle_;
   BOOL hasTabStrip_;
   NSButton* closeButton_;
   NSButton* miniaturizeButton_;
   NSButton* zoomButton_;
 
   CGFloat windowButtonsInterButtonSpacing_;
 }
 
 // Designated initializer.
@@ skipping 21 matching lines @@
                             bounds:(NSRect)bounds
               forceBlackBackground:(BOOL)forceBlackBackground;
 
 // Gets the color to draw title text.
 - (NSColor*)titleColor;
 
 @end
 
 @interface NSWindow (UndocumentedAPI)
 
-// Undocumented Cocoa API to suppress drawing of the window's title.
-// -setTitle: still works, but the title set only applies to the
-// miniwindow and menus (and, importantly, Expose).  Overridden to
-// return |shouldHideTitle_|.
+// Undocumented Cocoa API (10.6-10.9) to suppress drawing of the window's title.
+// -setTitle: still works, but the title set only applies to the miniwindow and
+// menus (and, importantly, Expose). Overridden to return |shouldHideTitle_|.
 -(BOOL)_isTitleHidden;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_FRAMED_BROWSER_WINDOW_H_