Remove WebContents::IsActiveEntry from Instant Extended and from WebContents.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index c8a0355b6cb4377934b56cb1b68346e33b35c5e2..0458c36f1be53681cabe9ec4e45ad19f787ac856 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -268,8 +268,6 @@ class CONTENT_EXPORT WebContentsImpl
       const base::FilePath& file,
       const base::Callback<void(int64)>& callback)
           OVERRIDE;
-  virtual bool IsActiveEntry(int32 page_id) OVERRIDE;
-
   virtual const std::string& GetContentsMimeType() const OVERRIDE;
   virtual bool WillNotifyDisconnection() const OVERRIDE;
   virtual void SetOverrideEncoding(const std::string& encoding) OVERRIDE;