This cl fixes some compilation failures we faced when compiling
for arm64 (aarch64, basically, with gcc). As long as
official chrome is also compiled for arm64, we propose a fix
for these trivial problems:

../../ui/views/examples/box_layout_example.cc: In member function 'void views::examples::{anonymous}::ChildPanel::SetSelected(bool)':
../../ui/views/examples/box_layout_example.cc:167:34: error: 'void views::examples::BoxLayoutExample::RefreshLayoutPanel()' is private within this context
  example_->RefreshLayoutPanel();
                               ^

and

../../chrome/browser/devtools/devtools_file_system_indexer.cc:37:12: error: 'set' is already declared in this scope
  using std::set;
               ^

Bug: None
Change-Id: I08cc6e0bc3e5819ab4f13f39a9abf5bd4f1dd1a5
Reviewed-on: https://chromium-review.googlesource.com/612984


Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494745}