Move download filename determintion into a separate class.

chrome/browser/download/download_test_file_activity_observer.cc

Index: chrome/browser/download/download_test_file_activity_observer.cc
diff --git a/chrome/browser/download/download_test_file_activity_observer.cc b/chrome/browser/download/download_test_file_activity_observer.cc
index 2137409dea736177b4e7bfb4ec306df8d5eeeabc..0dca0d97a2d8868614b3353bba4235ecac595c17 100644
--- a/chrome/browser/download/download_test_file_activity_observer.cc
+++ b/chrome/browser/download/download_test_file_activity_observer.cc
@@ -38,10 +38,10 @@ class DownloadTestFileActivityObserver::MockDownloadManagerDelegate
 
  protected:
 
-  virtual void ChooseDownloadPath(content::DownloadItem* item,
-                                  const base::FilePath& suggested_path,
-                                  const FileSelectedCallback&
-                                      callback) OVERRIDE {
+  virtual void PromptUserForDownloadPath(content::DownloadItem* item,
+                                         const base::FilePath& suggested_path,
+                                         const FileSelectedCallback&
+                                             callback) OVERRIDE {
     file_chooser_displayed_ = true;
     MessageLoop::current()->PostTask(
         FROM_HERE, base::Bind(callback, (file_chooser_enabled_ ? suggested_path