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Now, GuestViewBase takes full responsibility for managing the lifetime of the guest WebContents. The only signal coming from content is that indicating that the BrowserPlugin has been destroyed.

BUG=364141, 330264
TBR=jam@chromium.org for trivial browser_plugin_guest_delegate.h code deletion (w00t!)

Review URL: https://codereview.chromium.org/306003002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273759 0039d316-1c4b-4281-b951-d872f2087c98