[Android] Fix uiautomator command line flag after r242933.

BUG=331798
TBR=navabi@chromium.org

Review URL: https://codereview.chromium.org/122223003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243127 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243127