Clean the machine before running commands in the mini_installer test framework.

chrome/test/mini_installer/uninstall_chrome.py

Index: chrome/test/mini_installer/uninstall_chrome.py
diff --git a/chrome/test/mini_installer/uninstall_chrome.py b/chrome/test/mini_installer/uninstall_chrome.py
index f501856737d1b6eee8869193cbe9d83e7013d2c4..c2c0e8f4da06e91eaca96ab3f9de2c1f3b663213 100644
--- a/chrome/test/mini_installer/uninstall_chrome.py
+++ b/chrome/test/mini_installer/uninstall_chrome.py
@@ -20,6 +20,9 @@ def main():
                     default=False, help='Uninstall Chrome at system level.')
   parser.add_option('--chrome-long-name', default='Google Chrome',
                     help='Google Chrome or Chromium)')
+  parser.add_option('--silent', action='store_true', dest='silent',

[gab, 2013/09/13 15:06:19]

How about: --no-error-if-absent or something more verbose like that?

To avoid confusion between this and --interactive option proposed above.

[sukolsak, 2013/09/13 15:59:33]

Will do.

[gab, 2013/09/13 20:12:55]

I meant in this CL...

[sukolsak, 2013/09/13 23:11:14]

Done. Yes, I was waiting for your reply.

[gab, 2013/09/16 13:59:58]

Ah ok, my bad :)!

+                    default=False, help='Silently return if the registry key '
+                                        'for uninstalling Chrome is not found')
   options, _ = parser.parse_args()
 
   # TODO(sukolsak): Add support for uninstalling MSI-based Chrome installs when
@@ -34,6 +37,8 @@ def main():
   try:
     key = _winreg.OpenKey(root_key, sub_key, 0, _winreg.KEY_QUERY_VALUE)
   except WindowsError:
+    if options.silent:
+      return 1

[gab, 2013/09/13 15:06:19]

I'd say we should return 0 here.

[sukolsak, 2013/09/13 15:59:33]

Will do.

[gab, 2013/09/13 20:12:55]

I meant in this CL...

[sukolsak, 2013/09/13 23:11:14]

Done.

     raise KeyError('Registry key %s\\%s is missing' % (
         'HKEY_LOCAL_MACHINE' if options.system_level else 'HKEY_CURRENT_USER',
         sub_key))