clang/win: Fix another -Wunused-local-typedef warning.

clang/win: Fix another -Wunused-local-typedef warning.

Fixes

..\..\chrome/installer/mini_installer/mini_string.h(77,36) :  error: unused typedef 'invalid_buffer_size' [-Werror,-Wunused-local-typedef]
    COMPILE_ASSERT(kCapacity != 0, invalid_buffer_size);
                                   ^
..\..\chrome/installer/mini_installer/mini_string.h(13,41) :  note: expanded from macro 'COMPILE_ASSERT'
    typedef CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
                                        ^

BUG=411648
TBR=robertshield

Committed: https://crrev.com/c1417ea468bf47c3359f39fff0e0aa3fee6390a4
Cr-Commit-Position: refs/heads/master@{#339541}

[Nico, 2015-07-20 21:04:37]

The CQ bit was checked by thakis@chromium.org

[Nico, 2015-07-20 21:04:56]

(looks like this intentionally doesn't depend on base)

[commit-bot: I haz the power, 2015-07-20 21:05:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1248483002/1

[robertshield, 2015-07-20 22:06:10]

Lgtm, and yes not depending on base is intentional here.

[commit-bot: I haz the power, 2015-07-20 22:38:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-20 22:39:01]

Patchset 1 (id:??) landed as
https://crrev.com/c1417ea468bf47c3359f39fff0e0aa3fee6390a4
Cr-Commit-Position: refs/heads/master@{#339541}