Due to ref-counted references the NSView is not destroyed immediately
when WebContents is destroyed, so it is not reliable to do this in
the destructor.
After the BRYInspectableWebContentsView is added as subview to other
NSWindow owned by users, the view_ would not be dealloc when the web
contents got destroyed, which made the devtools window a ghost.
This class can be used to create a content::WebContents that can be inspected
by the Chrome Dev Tools. This requires embedding applications to copy
content_shell.pak into their resource bundle.
Right now the dev tools are always docked to the bottom of the view; we don't
yet support undocking or changing the docked side.
Fixes#1.
