Clear the clipboard closing Incognito window

content/public/browser/browser_context.h

Index: content/public/browser/browser_context.h
diff --git a/content/public/browser/browser_context.h b/content/public/browser/browser_context.h
index a1b5d7b5239b9b9bfa5711d46935095fcf182647..a565cac9955eb1d3a59468d37beff964f3d68f88 100644
--- a/content/public/browser/browser_context.h
+++ b/content/public/browser/browser_context.h
@@ -10,6 +10,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
+#include "ui/base/clipboard/clipboard.h"
 
 class GURL;
 
@@ -94,6 +95,12 @@ class CONTENT_EXPORT BrowserContext : public base::SupportsUserData {
   // Tells the HTML5 objects on this context to purge any uneeded memory.
   static void PurgeMemory(BrowserContext* browser_context);
 
+  // Returns a Clipboard::SourceTag (pointer) if |context| is OffTheRecord
+  // context. Otherwise, NULL. If the clipboard contains that SourceTag at the
+  // time of |context| destruction it will be flushed.
+  static ui::Clipboard::SourceTag GetMarkerForOffTheRecordContext(
+      BrowserContext* context);
+
   virtual ~BrowserContext();
 
   // Returns the path of the directory where this context's data is stored.