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This CL removes BrowserPluginGuestManager entirely, leaving BrowserPlugin relying on the BrowserPluginGuestManagerDelegate interface. This CL significantly reduces complexity in content.

In a subsequent patch, BrowserPluginGuestManagerDelegate will be renamed BrowserPluginGuestManager. I am leaving that separate so it is clear what's going on.

BUG=364141, 330264

Review URL: https://codereview.chromium.org/269113002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269680 0039d316-1c4b-4281-b951-d872f2087c98