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Currently chromeos::InputMethodMenuButton is derived from both StatusAreaButton and InputMethodMenu, which violates the Chrome coding guideline. This change removes the multiple inheritance by adding InputMethodMenu object to InputMethodMenuButton as a member variable.

BUG=chromium-os:7572
TEST=manually & try bot

Review URL: http://codereview.chromium.org/6262012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72467 0039d316-1c4b-4281-b951-d872f2087c98