Fix File Copy Manager Wrapper to work in the strict mode.

After enabling strict mode, butter bar stopped working, since wrapper became not accessible from the backgroudn copy manager. This patch solves this issue by converting a global variable to a class member and exporting the class.

NOTRY=true
TEST=Copying should display the butter bar.
BUG=none


Review URL: https://chromiumcodereview.appspot.com/12790007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@189585 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed