Don't update Chrome's uninstall command line if it is not installed (as per the comments).
Don't update Chrome's uninstall command line if it is not installed (as per the comments).

TEST=When installing only chrome frame in multi mode, a Chrome uninstall entry should not be added to the Add/Remove Programs list.  This is a regression from when ready-mode whas implemented.
BUG=none

Review URL: http://codereview.chromium.org/5962014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@70333 0039d316-1c4b-4281-b951-d872f2087c98

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