Clear the clipboard closing Incognito window

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 9fe6af0483e94ed896c6c57f23deb9fa1f3768d7..ac7093e7d6679d3dd590ce8191778bcba53942d1 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -68,6 +68,7 @@ class SpeechRecognitionManagerDelegate;
 class WebContents;
 class WebContentsView;
 class WebContentsViewDelegate;
+struct ClipboardWriteCallbackParams;
 struct MainFunctionParams;
 struct ShowDesktopNotificationHostMsgParams;
 
@@ -444,6 +445,11 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Returns the directory containing hyphenation dictionaries.
   virtual FilePath GetHyphenDictionaryDirectory();
 
+  // Called before writing clipboard content, thus allowing an embedder to
+  // modify the contents of Clipboard::ObjectMap.
+  virtual void BeforeWriteToClipboard(
+      const ClipboardWriteCallbackParams& params) {}
+
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   // Populates |mappings| with all files that need to be mapped before launching
   // a child process.