Linux Aura: Hide title bar when CustomFrameView maximized on Unity.

chrome/browser/ui/views/chrome_views_delegate.cc

Index: chrome/browser/ui/views/chrome_views_delegate.cc
diff --git a/chrome/browser/ui/views/chrome_views_delegate.cc b/chrome/browser/ui/views/chrome_views_delegate.cc
index 8bb35263d77fa4011bd2cc7d29fd4d5184cff1a0..213e3b2c2edf6976efa7b8373dbb557a5cf3dbbe 100644
--- a/chrome/browser/ui/views/chrome_views_delegate.cc
+++ b/chrome/browser/ui/views/chrome_views_delegate.cc
@@ -39,6 +39,10 @@
 #include "ui/views/widget/native_widget_aura.h"
 #endif
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+#include "ui/views/linux_ui/linux_ui.h"
+#endif
+
 #if defined(USE_ASH)
 #include "ash/shell.h"
 #include "ash/wm/window_state.h"
@@ -302,6 +306,17 @@ ChromeViewsDelegate::GetDefaultTextfieldObscuredRevealDuration() {
   return base::TimeDelta();
 }
 
+bool ChromeViewsDelegate::WindowManagerProvidesTitleBar(bool maximized) {
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+  // On Ubuntu Unity, the system always provides a title bar for maximized
+  // windows.
+  views::LinuxUI* ui = views::LinuxUI::instance();
+  return maximized && ui && ui->UnityIsRunning();
+#endif
+
+  return false;
+}
+
 #if !defined(USE_AURA) && !defined(USE_CHROMEOS)
 views::Widget::InitParams::WindowOpacity
 ChromeViewsDelegate::GetOpacityForInitParams(