Fix an out-of-date issue in chrome.webNavigation document.

chrome/browser/extensions/api/web_navigation/web_navigation_api_helpers.cc

Index: chrome/browser/extensions/api/web_navigation/web_navigation_api_helpers.cc
diff --git a/chrome/browser/extensions/api/web_navigation/web_navigation_api_helpers.cc b/chrome/browser/extensions/api/web_navigation/web_navigation_api_helpers.cc
index fe11eeffc96f3d15eb54e7d0709a26a06c8416c2..f85b3f4cb6f462e061178cd58cc06f7b2a3105e1 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_api_helpers.cc
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_api_helpers.cc
@@ -99,9 +99,13 @@ void DispatchOnCommitted(const std::string& event_name,
   dict->SetInteger(keys::kProcessIdKey,
                    web_contents->GetRenderViewHost()->GetProcess()->GetID());
   dict->SetInteger(keys::kFrameIdKey, GetFrameId(is_main_frame, frame_id));
-  dict->SetString(
-      keys::kTransitionTypeKey,
-      content::PageTransitionGetCoreTransitionString(transition_type));
+  std::string transition_type_string =
+      content::PageTransitionGetCoreTransitionString(transition_type);
+  // For webNavigation API backward compatibility, keep "start_page" even after
+  // renamed to "auto_toplevel".
+  if (transition_type_string == "auto_toplevel")

[jochen (gone - plz use gerrit), 2014/01/22 11:30:02]

nit transition_type == PAGE_TRANSITION_TYPE_AUTO_TOPLEVEL

[Haojian Wu, 2014/01/22 12:05:13]

Done.

+     transition_type_string = "start_page";
+  dict->SetString(keys::kTransitionTypeKey, transition_type_string);
   base::ListValue* qualifiers = new base::ListValue();
   if (transition_type & content::PAGE_TRANSITION_CLIENT_REDIRECT)
     qualifiers->Append(new base::StringValue("client_redirect"));