Hide WebContentsView from Chrome. This also removes WebContentsViewPort.

TestWebContentsView goes away since it's not needed anymore

BUG=304341
[email protected], [email protected]

Review URL: https://codereview.chromium.org/262823006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@268072 0039d316-1c4b-4281-b951-d872f2087c98
237 files changed