Remove default key slot from KeygenHandler.

content/shell/browser/shell_browser_context.h

Index: content/shell/browser/shell_browser_context.h
diff --git a/content/shell/browser/shell_browser_context.h b/content/shell/browser/shell_browser_context.h
index a5b57a2366d286c55350589624ab921e1abee3c0..b8a7dd882931d0e72a839885f6996dc4fbeffcda 100644
--- a/content/shell/browser/shell_browser_context.h
+++ b/content/shell/browser/shell_browser_context.h
@@ -35,6 +35,12 @@ class ShellBrowserContext : public BrowserContext {
   }
 
   // BrowserContext implementation.
+  virtual void CreateKeygenHandler(
+      uint32 key_size_in_bits,
+      const std::string& challenge_string,
+      const GURL& url,
+      const base::Callback<void(scoped_ptr<net::KeygenHandler>)>& callback)
+      OVERRIDE;
   virtual base::FilePath GetPath() const OVERRIDE;
   virtual bool IsOffTheRecord() const OVERRIDE;
   virtual DownloadManagerDelegate* GetDownloadManagerDelegate() OVERRIDE;