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This patch fixes the libusb vs2010 build break as reported by a few people, as
well as makes the libusb build conditional on not being on the Android
platform.

BUG=none
TEST=none


Review URL: http://codereview.chromium.org/9969185

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@132595 0039d316-1c4b-4281-b951-d872f2087c98