DevToolsWindow represents a vanilla top-level window that shows the dev tools.
It uses ui::WindowImpl to implement window functionality, which requires a
newer libchromiumcontent which contains the necessary headers for using that
class, and requires some modifications to brightray.gypi to make WTL's headers
available.
* vendor/libchromiumcontent 2f53a96...fc02d93 (4):
> Export third_party/wtl/include headers
> Export test_support_base.pdb and test_support_content.pdb
> Fix linker errors with test_support_base on Windows
> Fix linker errors with base_prefs_test_support on Windows
