[Mac] Don't show a title on app windows.

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

Index: chrome/browser/ui/cocoa/apps/native_app_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/apps/native_app_window_cocoa.mm b/chrome/browser/ui/cocoa/apps/native_app_window_cocoa.mm
index 1a5b1d0405d8f5ac01770fff6d3bf566cae38470..0f3ed29fb6164d3da994d96536aadf85c83fe03d 100644
--- a/chrome/browser/ui/cocoa/apps/native_app_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/apps/native_app_window_cocoa.mm
@@ -46,6 +46,7 @@ using apps::AppWindow;
 
 @interface NSWindow (NSPrivateApis)
 - (void)setBottomCornerRounded:(BOOL)rounded;
+- (BOOL)_isTitleHidden;
 @end
 
 // Replicate specific 10.7 SDK declarations for building with prior SDKs.
@@ -223,6 +224,11 @@ std::vector<gfx::Rect> CalculateNonDraggableRegions(
 @interface ShellNSWindow : ChromeEventProcessingWindow
 @end
 @implementation ShellNSWindow
+
+- (BOOL)_isTitleHidden {

[tapted, 2014/06/06 06:57:51]

nit: perhaps a comment, like ~Similar to ChromeBrowserWindow, don't draw the
title, but allow it to be seen in menus, Expose, etc.

[jackhou1, 2014/06/06 07:08:34]

Done.

+  return YES;
+}
+
 @end
 
 @interface ShellCustomFrameNSWindow : ShellNSWindow {