GitLab

* Fix button class detection (added CustomButton::AsCustomButtton)
* Removed obsolete touch specific color scheme. Instead, use
 NativeTheme as that's what MenuItemView is using.

BUG=177228

Review URL: https://codereview.chromium.org/82113004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238241 0039d316-1c4b-4281-b951-d872f2087c98