Don't draw a window title on browser windows.

chrome/browser/ui/cocoa/apps/native_app_window_cocoa.mm

 // Copyright 2013 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.
 
 #include "chrome/browser/ui/cocoa/apps/native_app_window_cocoa.h"
 
 #include "apps/app_shim/extension_app_shim_handler_mac.h"
 #include "base/command_line.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
@@ skipping 193 matching lines @@
 @interface NSView (PrivateMethods)
 - (CGFloat)roundedCornerRadius;
 @end
 
 // TODO(jamescook): Should these be AppNSWindow to match apps::AppWindow?
 // http://crbug.com/344082
 @interface ShellNSWindow : ChromeEventProcessingWindow
 @end
 @implementation ShellNSWindow
 
+- (instancetype)initWithContentRect:(NSRect)contentRect
+                          styleMask:(NSUInteger)windowStyle
+                            backing:(NSBackingStoreType)bufferingType
+                              defer:(BOOL)deferCreation {
+  if ((self = [super initWithContentRect:contentRect
+                               styleMask:windowStyle
+                                 backing:bufferingType
+                                   defer:deferCreation])) {
+    if ([self respondsToSelector:@selector(setTitleVisibility:)])
+      self.titleVisibility = NSWindowTitleHidden;
+  }
+
+  return self;
+}
+
 // Similar to ChromeBrowserWindow, don't draw the title, but allow it to be seen
 // in menus, Expose, etc.
 - (BOOL)_isTitleHidden {
-  return YES;
+  // Only intervene with 10.6-10.9.
+  if ([self respondsToSelector:@selector(setTitleVisibility:)])
+    return [super _isTitleHidden];
+  else
+    return YES;
 }
 
 @end
 
 @interface ShellCustomFrameNSWindow : ShellNSWindow {
  @private
   base::scoped_nsobject<NSColor> color_;
   base::scoped_nsobject<NSColor> inactiveColor_;
 }
 
@@ skipping 735 matching lines @@
 }
 
 void NativeAppWindowCocoa::UpdateRestoredBounds() {
   if (IsRestored(*this))
     restored_bounds_ = [window() frame];
 }
 
 void NativeAppWindowCocoa::HideWithoutMarkingHidden() {
   [window() orderOut:window_controller_];
 }