GitLab

Motivated by issues I had working in BrowserView and BrowserViewLayout:
* Remove unnecessary virtual keyword and protected section, as this class
  has no subclasses.
* Grouped overridden methods together.
* Fixed function order in .cc file.
* Renamed contents_container_ to contents_web_view_, as it is a WebView
* Renamed contents_ to contents_container_, as it is a ContentsContainer

BUG=232971
TEST=compiles, existing browser tests

Review URL: https://codereview.chromium.org/14205026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194999 0039d316-1c4b-4281-b951-d872f2087c98