shell_util: AddFileAssociations now correctly quotes "%1" arguments.

shell_util: AddFileAssociations now correctly quotes "%1" arguments.

Instead of GetCommandLineString, uses
GetCommandLineStringWithPlaceholders, which is specially designed to
quote placeholder arguments like "%1". This is necessary when writing a
command line to the Windows registry, because otherwise Windows may put
a filename with a space in it, and recognise it as two separate
arguments.

BUG=130455
Committed: https://crrev.com/b45fe1fab91262985cb4836add4b3feb873364e8
Cr-Commit-Position: refs/heads/master@{#301114}

[Matt Giuca, 2014-10-24 06:36:01]

mgiuca@chromium.org changed reviewers:
+ grt@chromium.org

[Matt Giuca, 2014-10-24 06:36:02]

This was a mistake in my previous CL (https://codereview.chromium.org/487693002)
-- I wrote GetCommandLineStringWithPlaceholders for this purpose and then forgot
to use it.

[grt (UTC plus 2), 2014-10-24 15:20:27]

The CQ bit was checked by grt@chromium.org

[grt (UTC plus 2), 2014-10-24 15:20:27]

lgtm

[commit-bot: I haz the power, 2014-10-24 15:21:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/669943003/1

[commit-bot: I haz the power, 2014-10-24 16:08:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-24 16:09:38]

Patchset 1 (id:??) landed as
https://crrev.com/b45fe1fab91262985cb4836add4b3feb873364e8
Cr-Commit-Position: refs/heads/master@{#301114}