Remove GalleryBrowserTestBase member scripts_

Per http:crrev.com/336357 the variable existed when the old file
manager browser test was split up after growing too large. It is
not used in GalleryBrowserTestBase today: remove scripts_.

Test: browser_tests --gtest_filter=GalleryBrowserTest*
Bug: 804413
Change-Id: Iada83b00c5644d8ea8d9d3a334affe103a59d1db
Reviewed-on: https://chromium-review.googlesource.com/991772
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547660}

chrome/browser/chromeos/file_manager/gallery_browsertest.cc

@@ -22,7 +22,6 @@ class GalleryBrowserTestBase : public FileManagerBrowserTestBase {
   void set_test_case_name(const std::string& name) { test_case_name_ = name; }
 
  private:
-  base::ListValue scripts_;
   std::string test_case_name_;
 };