Clear the clipboard closing Incognito window

content/browser/renderer_host/render_widget_host_view_gtk.cc

Index: content/browser/renderer_host/render_widget_host_view_gtk.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.cc b/content/browser/renderer_host/render_widget_host_view_gtk.cc
index ca71db99b562caf36bcb11ec0a5dd4dd40273da0..d47e337c81d15af07999d45f5b5fa82a1de4441b 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.cc
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.cc
@@ -36,6 +36,7 @@
 #include "content/browser/renderer_host/render_view_host_delegate.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/common/gpu/gpu_messages.h"
+#include "content/public/browser/browser_context.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/common/content_switches.h"
 #include "skia/ext/platform_canvas.h"
@@ -43,6 +44,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/gtk/WebInputEventFactory.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/x11/WebScreenInfoFactory.h"
+#include "ui/base/clipboard/scoped_clipboard_writer.h"
 #include "ui/base/gtk/gtk_compat.h"
 #include "ui/base/text/text_elider.h"
 #include "ui/base/x/active_window_watcher_x.h"
@@ -942,10 +944,13 @@ void RenderWidgetHostViewGtk::SelectionChanged(const string16& text,
     return;
   }
 
-  std::string utf8_selection = UTF16ToUTF8(text.substr(pos, n));
-  GtkClipboard* x_clipboard = gtk_clipboard_get(GDK_SELECTION_PRIMARY);
-  gtk_clipboard_set_text(
-      x_clipboard, utf8_selection.c_str(), utf8_selection.length());
+  BrowserContext* browser_context = host_->GetProcess()->GetBrowserContext();
+  // Set the BUFFER_SELECTION to the ui::Clipboard.
+  ui::ScopedClipboardWriter clipboard_writer(
+      ui::Clipboard::GetForCurrentThread(),
+      ui::Clipboard::BUFFER_SELECTION,
+      BrowserContext::GetMarkerForOffTheRecordContext(browser_context));
+  clipboard_writer.WriteText(text.substr(pos, n));
 }
 
 void RenderWidgetHostViewGtk::SelectionBoundsChanged(