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Use this pattern to replace existing methods in BrowserPluginGuestManager. This CL is just a refactor, there is no change in functionality.

BUG=330843

Review URL: https://codereview.chromium.org/128563002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243893 0039d316-1c4b-4281-b951-d872f2087c98