chrome/installer/util: Fix warnings found by clang chromium-style plugin on Windows.

chrome/installer/util: Fix warnings found by clang chromium-style plugin on Windows.

http://build.chromium.org/p/chromium.fyi/builders/CrWinClang/builds/611/steps/compile/logs/stdio

This fixes the following kind or warnings:

warning(clang): [chromium-style] Complex constructor has an inline body.
warning(clang): [chromium-style] Complex class/struct needs an explicit out-of-line destructor.

BUG=467287
R=thakis@chromium.org,grt@chromium.org

Committed: https://crrev.com/c5ab93d728a42b9eeeea4994097aed1b2fcea478
Cr-Commit-Position: refs/heads/master@{#327217}

[Nico, 2015-04-27 23:15:55]

lgtm!

[grt (UTC plus 2), 2015-04-28 02:01:09]

lgtm2. thanks for the cleanup!

[grt (UTC plus 2), 2015-04-28 02:01:29]

On 2015/04/28 02:01:09, grt wrote:
> lgtm2. thanks for the cleanup!

lgtm without the too for the sake of tooling.

[Nico, 2015-04-28 02:02:17]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-04-28 02:02:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1111613002/1

[commit-bot: I haz the power, 2015-04-28 02:06:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-28 02:07:13]

Patchset 1 (id:??) landed as
https://crrev.com/c5ab93d728a42b9eeeea4994097aed1b2fcea478
Cr-Commit-Position: refs/heads/master@{#327217}