Pass the --force-clean option to the mini_installer test framework.
Pass the --force-clean option to the mini_installer test framework.

Pass the --force-clean option to the mini_installer test framework so that it uninstalls existing Chrome or Chromium before running the tests.

BUG=264859

Review URL: https://chromiumcodereview.appspot.com/23546012

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@223601 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build