Gave native File Browser file handlers higher priority than 3rd party handlers.

chrome/browser/chromeos/extensions/file_handler_util.cc

Index: chrome/browser/chromeos/extensions/file_handler_util.cc
diff --git a/chrome/browser/chromeos/extensions/file_handler_util.cc b/chrome/browser/chromeos/extensions/file_handler_util.cc
index 743f8c548cd5edbbddf5719ee1d67013a78625fb..9303c232a2f918a21acaa3345d7b834867bee3a4 100644
--- a/chrome/browser/chromeos/extensions/file_handler_util.cc
+++ b/chrome/browser/chromeos/extensions/file_handler_util.cc
@@ -177,6 +177,7 @@ bool CrackTaskID(const std::string& task_id,
 // that are shared
 bool FindCommonTasks(Profile* profile,
                      const std::vector<GURL>& files_list,
+                     const std::string& privileged_extension_id,
                      LastUsedHandlerList* named_action_list) {
   named_action_list->clear();
   ActionSet common_tasks;
@@ -213,6 +214,13 @@ bool FindCommonTasks(Profile* profile,
        iter != common_tasks.end(); ++iter) {
     // Get timestamp of when this task was used last time.
     int last_used_timestamp = 0;
+
+    if ((*iter)->extension_id() == privileged_extension_id) {
+      // Give a little bump to the action from the 'privileged' extension
+      // (normally the File Browser) so that it becomes the default on a fresh
+      // profile when none of the action has been used yet.
+      last_used_timestamp = 1;
+    }
     prefs_tasks->GetInteger(MakeTaskID((*iter)->extension_id(), (*iter)->id()),
                             &last_used_timestamp);
     URLPatternSet matching_patterns = GetAllMatchingPatterns(*iter, files_list);
@@ -224,13 +232,16 @@ bool FindCommonTasks(Profile* profile,
   return true;
 }
 
-bool GetDefaultTask(
-    Profile* profile, const GURL& url, const FileBrowserHandler** handler) {
+bool GetDefaultTask(Profile* profile,
+                    const GURL& url,
+                    const std::string& privileged_extension_id,
+                    const FileBrowserHandler** handler) {
   std::vector<GURL> file_urls;
   file_urls.push_back(url);
 
   LastUsedHandlerList common_tasks;
-  if (!FindCommonTasks(profile, file_urls, &common_tasks))
+  if (!FindCommonTasks(
+      profile, file_urls, privileged_extension_id, &common_tasks))
     return false;
 
   if (common_tasks.size() == 0)