Add error description to the DidFailProvisionalLoad callback.

chrome/browser/extensions/extension_webnavigation_api.h

Index: chrome/browser/extensions/extension_webnavigation_api.h
diff --git a/chrome/browser/extensions/extension_webnavigation_api.h b/chrome/browser/extensions/extension_webnavigation_api.h
index 932734f6eb7ad5b311cd399d891e4d2f39a875d1..5d24907fac3e14907e9d0f18c34c0205f0fec1ac 100644
--- a/chrome/browser/extensions/extension_webnavigation_api.h
+++ b/chrome/browser/extensions/extension_webnavigation_api.h
@@ -142,10 +142,12 @@ class ExtensionWebNavigationTabObserver : public TabContentsObserver {
       bool is_main_frame,
       const GURL& url,
       PageTransition::Type transition_type) OVERRIDE;
-  virtual void DidFailProvisionalLoad(int64 frame_id,
-                                      bool is_main_frame,
-                                      const GURL& validated_url,
-                                      int error_code) OVERRIDE;
+  virtual void DidFailProvisionalLoad(
+      int64 frame_id,
+      bool is_main_frame,
+      const GURL& validated_url,
+      int error_code,
+      const string16& error_description) OVERRIDE;
   virtual void DocumentLoadedInFrame(int64 frame_id) OVERRIDE;
   virtual void DidFinishLoad(int64 frame_id) OVERRIDE;
   virtual void DidOpenRequestedURL(TabContents* new_contents,