Simplify update error message support HTML.

chrome/browser/google/google_update_win.h

Index: chrome/browser/google/google_update_win.h
diff --git a/chrome/browser/google/google_update_win.h b/chrome/browser/google/google_update_win.h
index 0e02c76338509c39e8d1bc3a196d88a68c8b1491..149385af10fe8fb89d9812c1336c6f54b3f8990e 100644
--- a/chrome/browser/google/google_update_win.h
+++ b/chrome/browser/google/google_update_win.h
@@ -76,11 +76,13 @@ class UpdateCheckDelegate {
   virtual void OnUpgradeComplete(const base::string16& new_version) = 0;
 
   // Invoked following an unrecoverable error, indicated by |error_code|.
-  // |error_message|, if not empty, contains a localized string that may be
-  // presented to the user explaining the nature of the error. |new_version|, if
-  // not empty, indicates the version to which an upgrade attempt was made.
+  // |html_error_message|, if not empty, must be a localized string containing
+  // all information required by users to act on the error as well as for
+  // support staff to diagnose it (i.e. |error_code| and any other related
+  // state information).  |new_version|, if not empty, indicates the version
+  // to which an upgrade attempt was made.
   virtual void OnError(GoogleUpdateErrorCode error_code,
-                       const base::string16& error_message,
+                       const base::string16& html_error_message,
                        const base::string16& new_version) = 0;
 
  protected: