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This only moves code without changing any functionality.
This allows to expose the CryptohomeClientImplStub type and extend the class about *ForTest functions in the next step.

BUG=NONE

Review URL: https://chromiumcodereview.appspot.com/22630012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@216835 0039d316-1c4b-4281-b951-d872f2087c98