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This CL introduces the TranslateDelegate to inject the required
dependencies in the translate component.
TranslateDelegate is a singleton for now, but this will need to be
revisited once the ownership model of TranslateManager is improved.

BUG=331509

Review URL: https://codereview.chromium.org/131463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244199 0039d316-1c4b-4281-b951-d872f2087c98